人教版九年级上化学计算题 30道 要答案的 急求30道化学初三上册的计算题和20道实验探究题，要有答案的
\u6c42\u521d\u4e09\u4e0a\u5316\u5b66\u8ba1\u7b97\u989830\u9053\uff0c\u7b54\u6848\u8981\u6709\u8ba1\u7b97\u8fc7\u7a0b\u5c06\u5c31\u590d\u4e60\uff0c\u4e2d\u8003\u6765\u4e34\u4e86\uff0c\u771f\u8bda\u7684\u6c42\u5b66\u30022010\uff0e\u6d59\u6c5f\u53f0\u5dde\uff0938.\u786b\u5316\u6c22(H2S)\u662f\u4e00\u79cd\u5177\u6709\u81ed\u9e21\u86cb\u6c14\u5473\u7684\u81f4\u547d\u6bd2\u6c14\uff0c\u5b83\u7684\u5bc6\u5ea6\u6bd4\u7a7a\u6c14\u5927\uff0c\u53ef\u6eb6\u4e8e\u6c34\u5f62\u6210\u6c22\u786b\u9178\uff0c\u6c22\u786b\u9178\u5177\u6709\u9178\u7684\u901a\u6027\u3002\u5b9e\u9a8c\u5ba4\u5e38\u7528\u56fa\u4f53\u786b\u5316\u4e9a\u94c1(FeS)\u548c\u7a00\u786b\u9178\u5728\u5e38\u6e29\u4e0b\u5236\u5f97H2S\uff0c\u540c\u65f6\u751f\u6210FeS04\u3002
\uff081\uff09\u5728\u53f3\u56fe\u4e2d\uff0c\u5e94\u9009\u7528\u56fe \u4f5c\u4e3a\u5236\u53d6H2S\u7684\u88c5\u7f6e\u3002
\uff082\uff09\u6536\u96c6H2S\u6c14\u4f53\u65f6\uff0c\u5e94\u4eceC\u88c5\u7f6e\u4e2d\u7684 \u5bfc\u7ba1\u8fdb\u5165\uff0c\u5bf9\u4ea7\u751f\u5c3e\u6c14\u7684\u5904\u7406\u65b9\u6cd5
\u662f\uff1a \u3002
\uff083\uff09\u5b9e\u9a8c\u5ba4\u82e5\u5236\u53d66.8\u514b\u7684\u786b\u5316\u6c22\u6c14\u4f53\uff0c\u7406\u8bba\u4e0a\u9700\u8981\u591a\u5c11\u514b20%\u7684\u786b\u9178\u6eb6\u6db2\uff1f
38\uff0e(1)B
(2)a \u7528\u6c34\u5438\u6536\uff08\u6216\u7528\u78b1\u6eb6\u6db2\u5438\u6536\uff0c\u5982\u6c22\u6c27\u5316\u94a0\u6216\u77f3\u7070\u6c34\u7b49\uff09
(3)\u89e3\u6cd5\u4e00\uff1a\u8bbe\u9700\u898120%\u786b\u9178\u6eb6\u6db2\u7684\u8d28\u91cf\u4e3aX\u514b
H2 S04 +FeS =H2S\u2191++FeS04
98 34
20%X 6.8\u514b
\u7b54\uff0c\u9700\u898120%\u786b\u9178\u6eb6\u6db2\u8d28\u91cf\u4e3a98\u514b
\u5316\u5b66\u00b7\u4e5d\u5e74\u7ea7\u4e0a\u00b7\u4eba\u6559\u7248
\u7eea\u8a00\u3000\u5316\u5b66\u4f7f\u4e16\u754c\u53d8\u5f97\u66f4\u52a0\u7eda\u4e3d\u591a\u5f69
1\uff0eD\u30002\uff0eD\u30003\uff0eD\u30004\uff0eB\u30005\uff0eD\u30006\uff0eD\u3000
7\uff0eC\u30008\uff0eA\u30009\uff0eB\u300010\uff0eC
11\uff0e\uff081\uff09\u2461\u3000\uff082\uff09\u2462\u3000\uff083\uff09\u2460
\uff084\uff09\u2463
12\uff0e\uff081\uff09\u2461\u2464\u3000\uff082\uff09\u2463\u2465\u2467\u3000\uff083\uff09\u2462\u2466\u3000
\uff084\uff09\u2460
13\uff0e\uff081\uff09\u5bf9\u73af\u5883\u65e0\u6c61\u67d3\u7684\u6e05\u6d01\u80fd\u6e90\u7684\u5f00\u53d1
\u3000\uff082\uff09\u5bf9\u53ef\u964d\u89e3\u5851\u6599\u7684\u5f00\u53d1\u3000\uff083\uff09\u5229\u7528\u5316\u5b66
\u539f\u7406\u4ece\u6e90\u5934\u4e0a\u6d88\u9664\u6c61\u67d3\uff08\u5176\u4ed6\u5408\u7406\u7b54\u6848\u5747\u53ef\uff09
14\uff0e\uff081\uff09\u53ef\u4ee5\u8282\u7ea6\u91d1\u5c5e\u8d44\u6e90\u3000\uff082\uff09\u53ef\u4ee5
\u51cf\u5c11\u5bf9\u73af\u5883\u7684\u5f71\u54cd\uff08\u5176\u4ed6\u5408\u7406\u7b54\u6848\u5747\u53ef\uff09
\u7b2c\u4e00\u5355\u5143\u3000\u8d70\u8fdb\u5316\u5b66\u4e16\u754c
\u8bfe\u98981\u3000\u7269\u8d28\u7684\u53d8\u5316\u548c\u6027\u8d28
1\uff0eB\u30002\uff0eA\u30003\uff0eB\u30004\uff0eD\u30005\uff0eB\u30006\uff0eD\u3000
7\uff0eC\u30008\uff0eA\u30009\uff0eB\u300010\uff0eC\u300011\uff0eC
12\uff0e\uff081\uff09\u5316\u5b66\u53d8\u5316\u3000\uff082\uff09\u7269\u7406\u53d8\u5316
13\uff0e\uff081\uff09\u7535\u706f\u5728\u901a\u7535\u65f6\u53d1\u5149\u662f\u7269\u7406\u53d8\u5316
\u3000\uff082\uff09\u7535\u706f\u5728\u901a\u7535\u65f6\u53d1\u70ed\u662f\u7269\u7406\u53d8\u5316\uff08\u6216\u8005
\u7535\u71a8\u6597\u5728\u901a\u7535\u65f6\u53d1\u70ed\u7b49\uff09\u3000\uff083\uff09\u7528\u6d82\u6599\u5237\u5899
\u5c5e\u4e8e\u7269\u7406\u53d8\u5316\u3000\uff084\uff09\u5e72\u51b0\u5347\u534e\u4ea7\u751f\u6c14\u4f53\u5c5e
\u4e8e\u7269\u7406\u53d8\u5316\u3000\uff085\uff09\u98df\u76d0\u6c34\u84b8\u53d1\u6709\u56fa\u4f53\u4ea7\u751f
\u5c5e\u4e8e\u7269\u7406\u53d8\u5316
14\uff0e\uff081\uff09\u2460\u2461\u2462\u3000\uff082\uff09\u2463\u2466\u3000\uff083\uff09\u2466
15\uff0e\u6211\u4eec\u4ece\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\u770b\u4e00\u4e0b\u8eab\u8fb9\u7684
\u5316\u5b66\uff1a\uff081\uff09\u8863\uff1a\u5316\u5b66\u7ea4\u7ef4\uff08\u4eba\u9020\u7ea4\u7ef4\u6216\u8005\u5408\u6210
\u7ea4\u7ef4\uff09\u3001\u805a\u4e19\u70ef\u65e0\u7eba\u5e03\u3001\u5851\u6599\u3001\u6a61\u80f6\u7684\u751f\u4ea7\u7b49\uff0c
\u6539\u53d8\u4e86\u4eba\u4eec\u7684\u8863\u7740\uff0c\u63d0\u9ad8\u4e86\u751f\u6d3b\u7684\u8d28\u91cf\u3002
\uff082\uff09\u98df\uff1a\u5316\u80a5\u3001\u519c\u836f\u7684\u7814\u5236\uff0c\u4f7f\u7cae\u98df\u3001\u852c\u83dc\u3001\u6c34
\u679c\u7b49\u751f\u4ea7\u5927\u4e30\u6536\uff0c\u4e0d\u4ec5\u89e3\u51b3\u4e86\u4eba\u4eec\u7684\u6e29\u9971\u95ee
\u9898\uff0c\u8fd8\u6539\u53d8\u4e86\u996e\u98df\u7ed3\u6784\uff0c\u4f7f\u4eba\u4eec\u7684\u996e\u98df\u671d\u7740
\u6709\u5229\u4e8e\u5065\u5eb7\u7684\u65b9\u5411\u53d1\u5c55\u3002\uff083\uff09\u4f4f\uff1a\u94a2\u94c1\u3001\u94dd\u3001
\u6c34\u6ce5\u3001\u5851\u94a2\u95e8\u7a97\u7b49\u5efa\u6750\u7684\u5927\u91cf\u751f\u4ea7\uff0c\u5e26\u52a8\u5efa
\u7b51\u4e1a\u7684\u84ec\u52c3\u53d1\u5c55\uff0c\u4f7f\u4eba\u4eec\u7684\u5c45\u4f4f\u6761\u4ef6\u5927\u5927\u6539
\u5584\u3002\uff084\uff09\u884c\uff1a\u77f3\u6cb9\u52a0\u5de5\u3001\u9ad8\u901f\u516c\u8def\u7684\u5efa\u8bbe\u3001\u5408
\u6210\u6a61\u80f6\u7684\u751f\u4ea7\u3001\u6c7d\u8f66\u7684\u5236\u9020\u4ee5\u53ca\u8f7f\u8f66\u8fdb\u5165\u5bb6
\u5ead\u7b49\uff0c\u4f7f\u4eba\u4eec\u51fa\u884c\u66f4\u52a0\u65b9\u4fbf\u3001\u5feb\u6377\u3002\uff085\uff09\u533b\uff1a
\u533b\u7597\u5668\u68b0\u3001\u836f\u54c1\u3001\u4fdd\u5065\u5668\u6750\u7684\u7814\u7a76\u3001\u533b\u9662\u8bbe\u5907
\u7684\u66f4\u65b0\u3001\u533b\u7597\u6761\u4ef6\u7684\u6539\u5584\uff0c\u4f7f\u4eba\u4eec\u7684\u5065\u5eb7\u72b6
\u51b5\u6709\u5f88\u5927\u7684\u6539\u89c2\u3002\uff086\uff09\u7528\uff1a\u4eba\u4eec\u65e5\u5e38\u6240\u7528\u7684
\u8ba1\u7b97\u673a\u3001\u7535\u89c6\u673a\u3001\u51b0\u7bb1\u3001\u6d17\u8863\u673a\u3001\u624b\u673a\u3001\u5404\u79cd\u9ecf
\u5408\u5242\u3001\u4e0d\u7c98\u9505\u3001\u94c5\u7b14\u3001\u5c3a\u5b50\u7b49\u7b49\uff0c\u65e0\u4e0d\u4f53\u73b0\u5316
\u5b66\u5e26\u7ed9\u6211\u4eec\u7684\u79cd\u79cd\u6539\u53d8\u3002
\u30002
\u4eba\u6559\u7248\u00b7\u5316\u5b66\u00b7\u4e5d\u5e74\u7ea7\uff08\u4e0a\uff09
\u8bfe\u98982\u3000\u5316\u5b66\u662f\u4e00\u95e8\u4ee5\u5b9e\u9a8c\u4e3a\u57fa\u7840\u7684\u79d1\u5b66
1\uff0eC\u30002\uff0eC\u30003\uff0eD\u30004\uff0eC\u30005\uff0eC\u30006\uff0eA\u3000
7\uff0eA\u30008\uff0eC\u30009\uff0eC\u300010\uff0eA
11\uff0e\u6c27\u6c14\u3000\u4e8c\u6c27\u5316\u78b3\u3000\u5de6
12\uff0e\u5c06\u96c6\u6c14\u74f6\u88c5\u6ee1\u6c34\uff0c\u76d6\u597d\u73bb\u7483\u7247\uff0c\u62ff\u8fdb
\u5c71\u6d1e\u540e\u5012\u6389\u6c34\uff0c\u518d\u76d6\u597d\u73bb\u7483\u7247\u62ff\u51fa\u6d1e\u5916\u5373\u53ef
13\uff0e\uff081\uff09\u547c\u51fa\u7684\u6c14\u4f53\u4f7f\u6f84\u6e05\u77f3\u7070\u6c34\u66f4
\u6d51\u6d4a
\uff082\uff09\u547c\u51fa\u7684\u6c14\u4f53\u5728\u73bb\u7483\u4e0a\u7ed3\u4e0b\u6c34\u73e0
\uff083\uff09\u71c3\u7740\u7684\u706b\u67f4\u5728\u547c\u51fa\u7684\u6c14\u4f53\u4e2d\u71c3\u70e7
\u65f6\u95f4\u7f29\u77ed
14\uff0e\uff081\uff09\u2460\u3000\u8721\u70db\u71c3\u70e7\u4ea7\u751f\u7684\u4e8c\u6c27\u5316\u78b3
\u4f1a\u4f7f\u6f84\u6e05\u77f3\u7070\u6c34\u53d8\u6d51\u6d4a\u3000\uff082\uff09\u6c34\u84b8\u6c14
\uff083\uff09\u2462\u3000\u2460\u3000\u4e8c\u6c27\u5316\u78b3\u4e0d\u652f\u6301\u71c3\u70e7
\u8bfe\u98983\u3000\u8d70\u8fdb\u5316\u5b66\u5b9e\u9a8c\u5ba4
1\uff0eC\u30002\uff0eC\u30003\uff0eB\u30004\uff0eC\u30005\uff0eA\u30006\uff0eD\u3000
7\uff0eC\u30008\uff0eC\u30009\uff0eD\u300010\uff0eD
11\uff0e\uff081\uff09\u91cf\u7b52\u3000\uff082\uff09\u80f6\u5934\u6ef4\u7ba1\u3000\uff083\uff09\u96c6\u6c14
\u74f6\u3000\uff084\uff09\u8bd5\u7ba1\u3000\uff085\uff09\u5769\u57da\u94b3\u3000\uff086\uff09\u94c1\u67b6\u53f0\u7684
\u94c1\u5939\u3000\uff087\uff09\u77f3\u68c9\u7f51\u3000\u4f7f\u70e7\u676f\u53d7\u70ed\u5747\u5300\u3000\uff088\uff09
\u954a\u5b50\u3000\u836f\u5319\u3000\u7eb8\u69fd
12\uff0e\uff081\uff09\u538b\u7834\u5bb9\u5668\u3000\uff082\uff09\u5931\u706b\u3000\uff083\uff09\u635f\u574f
\u5b9e\u9a8c\u53f0
13\uff0e100mL\u91cf\u7b52\u91cf\u7a0b\u6bd4\u8f83\u5927\uff0c\u8bfb\u6570\u65f6\u8bef
\u5dee\u4f1a\u8f83\u5927\uff1b100mL\u91cf\u7b52\u8868\u9762\u79ef\u8f83\u5927\uff0c\u6b8b\u7559\u5728
\u91cf\u7b52\u58c1\u4e0a\u7684\u6db2\u4f53\u8f83\u591a
14\uff0e\uff083\uff09
\u767d\u8272\u56fa\u4f53\uff0c\u4e2d\u95f4\u6709\u706f\u82af\u7194\u70b9\u9ad8\u4e8e\u5e38\u6e29\uff1b\u6709\u53ef\u71c3\u6027
\u71c3\u70e7\u3001\u6709\u706b\u7130\u3001\u653e\u70ed\u3001\u6709\u90e8
\u5206\u8721\u70db\u7194\u5316
\u8721\u70db\u6709\u53ef\u71c3\u6027\uff0c\u71c3\u70e7\u653e\u70ed\uff0c
\u706b\u7130\u8bf4\u660e\u662f\u8721\u70db\u84b8\u6c14\u5728\u71c3
\u70e7\uff0c\u8721\u70db\u53d7\u70ed\u7194\u5316
\u676f\u58c1\u4e0a\u6709\u6c34\u96fe\u751f\u6210\u6c34
\u77f3\u7070\u6c34\u53d8\u6d51\u6d4a\u751f\u6210\u4e8c\u6c27\u5316\u78b3
\u5e95\u90e8\u53d8\u9ed1\u53ef\u80fd\u662f\u70ad\u9ed1
\u8721\u70db\u706b\u7130\u7184\u706d
\u6c27\u6c14\u88ab\u9010\u6e10\u6d88\u8017\uff0c\u800c\u751f\u6210
\u7684\u4e8c\u6c27\u5316\u78b3\u53c8\u4e0d\u652f\u6301\u71c3\u70e7
\u6709\u767d\u70df\u8721\u70db\u84b8\u6c14\u51b7\u51dd\u7684\u7ed3\u679c
\u7b2c\u4e8c\u5355\u5143\u3000\u6211\u4eec\u5468\u56f4\u7684\u7a7a\u6c14
\u8bfe\u98981\u3000\u7a7a\u6c14
1\uff0eB\u30002\uff0eC\u30003\uff0eA\u30004\uff0eD\u30005\uff0eB\u30006\uff0eD\u3000
7\uff0eB\u30008\uff0eD\u30009\uff0eD\u300010\uff0eC
11\uff0e\uff081\uff09\u7269\u8d28\u80fd\u591f\u5728\u7a7a\u6c14\u4e2d\u71c3\u70e7\uff08\u98df\u7269
\u5728\u7a7a\u6c14\u4e2d\u5bb9\u6613\u53d8\u8d28\u3001\u91d1\u5c5e\u5728\u7a7a\u6c14\u4e2d\u751f\u9508\u7b49\uff09
\uff082\uff09\u5e72\u8106\u997c\u5e72\u5728\u7a7a\u6c14\u4e2d\u4f1a\u53d8\u6f6e\uff08\u51b0\u7bb1\u91cc\u62ff
\u51fa\u7684\u4e1c\u897f\u8868\u9762\u51fa\u73b0\u6c34\u73e0\uff0c\u51ac\u5929\u7a97\u6237\u4e0a\u7ed3\u971c\u7b49\uff09
\uff083\uff09\u690d\u7269\u80fd\u591f\u8fdb\u884c\u5149\u5408\u4f5c\u7528\uff08\u6f84\u6e05\u7684\u77f3
\u7070\u6c34\u653e\u7f6e\u5728\u7a7a\u6c14\u4e2d\u4f1a\u53d8\u6d51\u6d4a\u7b49\uff09
\uff084\uff09\u7a7a\u6c14\u4e2d\u542b\u6709\u5927\u91cf\u7684\u6c2e\u6c14
12\uff0e\u6c2e\u6c14\u3000\u6c27\u6c14\u3000\u6c2e\u6c14\u3000\u6c27\u6c14
13\uff0e\uff081\uff09\u4ea7\u751f\u5927\u91cf\u767d\u70df\u3000\u653e\u51fa\u5927\u91cf\u7684\u70ed\u3000
\u78f7\uff0b\u6c27\u6c14\u2192 \u70b9\u71c3
\u4e94\u6c27\u5316\u4e8c\u78f7\u3000\uff082\uff0915
\u3000\uff083\uff09\u4fdd
\u8bc1\u5c06\u6c27\u6c14\u6d88\u8017\u5b8c\uff0c\u4f7f\u5b9e\u9a8c\u7ed3\u679c\u51c6\u786e\u3000\uff084\uff09\u4e0d\u6613
\u6eb6\u4e8e\u6c34\u3000\u4e0d\u652f\u6301\u71c3\u70e7\u3000\uff085\uff09\u7ea2\u78f7\u7684\u91cf\u4e0d\u8db3\uff1b\u70e7
\u676f\u4e2d\u7684\u6c34\u4e0d\u591f\u591a\uff1b\u672a\u51b7\u5374\u5c31\u6253\u5f00\u6b62\u6c34\u5939\uff08\u5176\u4ed6
\u5408\u7406\u7b54\u6848\u5747\u53ef\uff09\u3000\uff086\uff09\u9632\u6b62\u4f38\u5165\u71c3\u70e7\u5319\u65f6\u96c6
\u6c14\u74f6\u5185\u7684\u6c14\u4f53\u6cc4\u6f0f\uff1b\u8be5\u88c5\u7f6e\u7684\u5bc6\u5c01\u6027\u597d
\u8bfe\u98982\u3000\u6c27\u6c14
1\uff0eA\u30002\uff0eA\u30003\uff0eD\u30004\uff0eA\u30005\uff0eD\u30006\uff0eD\u3000
7\uff0eB\u30008\uff0eB\u30009\uff0eB\u300010\uff0eA
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7\uff0eB\u30008\uff0eC\u30009\uff0eA\u300010\uff0eA
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13\uff0e\uff081\uff09D\u3000\uff082\uff09B\u3000\uff083\uff09C\u3000\uff084\uff09A\u3000
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7\uff0eD\u30008\uff0eD\u30009\uff0eA\u300010\uff0eC
11\uff0e11\u3000\u2461
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13\uff0eC\u3000B\u3001D\u3000A\u3000A\u3000A\u3001C
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7\uff0eD\u30008\uff0eA\u30009\uff0eC\u300010\uff0eC
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7\uff0eA\u30008\uff0eD\u30009\uff0eA\u300010\uff0eB
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12\uff0e\u2461 \uff1e\u2460 \uff1e\u2462
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14\uff0e\uff081\uff093Fe\uff0b2O2 \u70b9\u71c3Fe3O4
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7\uff0eC\u30008\uff0eD
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12\uff0e5\u300010\u300010\u300010
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7\uff0eA\u30008\uff0eC\u30009\uff0eA
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8\uff0e\uff081\uff09\u957f\u9888\u6f0f\u6597\u7684\u7ba1\u53e3\u672a\u4f38\u5165\u6db2\u9762\u4e0b
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1\uff0eD\u30002\uff0eC\u30003\uff0eD\u30004\uff0eB\u30005\uff0eB\u30006\uff0eC\u3000
7\uff0eD\u30008\uff0eD\u30009\uff0eD\u300010\uff0eB\u300011\uff0eD
12\uff0eCO2\u3000\u4e0d\u80fd\u71c3\u70e7\u3000CO\u3000\u6709\u6bd2\u3000CH4
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13\uff0eC\u3000CO2\u3000CO\u3000CaCO3
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7\uff0eB\u30008\uff0eA
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10\uff0e\uff081\uff09\u8336\u676f\u4e2d\u7684\u6c27\u6c14\u6d88\u8017\u5b8c\u4e86\u3000\uff082\uff09\u751f
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1 5\uff0c\u4e14\u4e0a\u8ff0\u5b9e\u9a8c\u767d\u78f7\u8db3\u91cf\u3001\u6c14\u5bc6\u6027\u826f\u597d\uff0c\u6240\u4ee5\u8fdb\u5165a\u8bd5\u7ba1\u6db2\u4f53\u7684\u4f53\u79ef\u5e94\u63a5\u8fd1\u8bd5\u7ba1\u5bb9\u79ef\u76841
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7\uff0eC\u30008\uff0eC\u30009\uff0eC
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12\uff0e\uff081\uff09\u8fd0\u52a8\u3000\uff082\uff09\u5316\u5b66\u3000\uff083\uff09\u51cf\u5c11\u6325
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7\uff0eC\u30008\uff0eD\u30009\uff0eB
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②计算氧化铁（）中铁元素的质量分数。
③含有相同质量铁元素的氧化铁（）与四氧化三铁（）的质量之比。
选题角度：考查有关元素质量、质量分数的相关运算。
思路分析：此题注意化学概念与数学计算的结合。计算化合物中各元素的质量比时，就是根据化学式计算出各元素原子的相对原子质量之和的最简整数比。
2.从1升10%的 溶液中取出100毫升，那么剩下900毫升 溶液的质量分数为（ ）
A．1% B．9% C．11.1% D．10%
3．把25℃含有少量未溶解 晶体的饱和溶液加热到80℃，变成不饱和溶液，这时溶液的浓度是（ ）
A．不变 B．增大 C．减少 D．无法判断
4．含溶质a克，溶剂b克的溶液，它的质量分数是（ ）
A． ×100% B． ×100%
C． ×100% D． ×100%
5．将50克10%的硫酸溶液跟50克20%的硫酸溶液混合后，溶液的浓度为（ ）
A．不变 B．5% C．15% D．30%
6．在100克稀硫酸中加入20%的硫酸100克，使浓度变为12%，则原稀溶液的浓度为（ ）
A．2% B．4% C．8% D．10%
7．在一定温度下稀释某一饱和溶液时，下列各量不变的是（ ）
A．溶液的质量 B．溶剂的质量
C．溶质的质量 D．溶液的浓度
8．a%的某酸溶液m克，稀释成b%，需加水（ ）
A． 克 B． 克 C． 克 D． 克
9．50℃时， 溶解度为50克，把50℃饱和溶液蒸发掉的50克水再恢复到50℃析出晶体后，其母液的质量分数为（ ）
A．20% B．25% C．30% D．33.3%
10.用60%的 溶液与10%的 混合配成20%的 溶液，其60%的 与10%的 的质量比为（ ）
A．1:6 B．1:5 C．1:4 D．1:3
11．现有50克浓度为10%的 溶液，要使其浓度增大一倍，可以采用的方法是（ ）
A．蒸发掉25克水 B．加水溶液变100克
C．增加10克溶质 D．增加6.25克溶质
12．现有200克浓度为10%的NaCl溶液，若使其浓度增大一倍，应往溶液中加入多少克NaCl？或蒸发多少克水？
13.向40 g 5％的氢氧化钠 溶液中加入60 g 10％的氢氧化钠 溶液，混合后的溶液中氢氧化钠 的质量分数为_______。上述混合溶液，恰好能跟_______g 10％的稀硫酸完全反应。
参考答案：
一、2．答案D
提示：溶液是均一的稳定的混合物，其均一性变是在溶液中各部分的性质是等同的。所以从1升 溶液中取出100毫升，则这100毫升溶液的性质与1升溶液的性质是等同的，所以浓度仍为10%。
3．答案B
提示： 的溶解度随温度的升高而加大，当温度从25℃上升到80℃时，含有少量 晶体的饱和溶液变成了不饱和溶液，这时，原来未溶解的少量 完全溶解了，则溶液中溶质的质量增加了，所以溶液的浓度增大了。
4．答案B
提示：由计算式
溶质的质量分数=（溶质的质量/溶液的质量）×100%=（溶质的质量/（溶质质量+溶剂质量））×100%
可直接得出答案为B。
5．答案C
提示：根据混合前后溶质质量不变的原则
设混合后溶液的质量分数为x%
50克×10%+50克×20%=（50克+50克）×x%
解得：x=15%
所以混合后溶液的质量分数为15%。
6.答案B
提示：根据混合前后溶质质量不变的原则
设原稀硫酸的浓度为x%
100克×x%+100克×20%=（100+100）×12%
x=4
所以原稀硫酸浓度为4%。
7．答案C
提示：稀释溶液是加入了溶剂，增加了溶剂量，所以溶液的质量与溶液的浓度都发生了变化，只有溶质质量在稀释前后不发生改变。
8．答案D
提示：根据稀释前后溶质质量不变的原则
设需加水x克
m克×a%=（m+x）克×b%
x= 克
9.答案D
10.答案C
11．答案A、D
12.加入25克氯化钠或蒸去100克水，均可使200克10%的氯化钠溶液浓度增大一倍。
13. 答案8％ 98
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