.欲使滴定时消耗0.10mol•L-1HC1溶液20～25 mL，问应称取基准试剂Na2CO3多少克？此时称量误差能否小 欲使滴定时消耗0.10mol/lhcl溶液2025ml，问应...
\u6b32\u4f7f\u6ef4\u5b9a\u65f6\u6d88\u80170.10mol/LHCI\u6eb6\u6db220-25mL\uff0c\u95ee\u5e94\u53d6\u57fa\u51c6\u8bd5\u5242Na2CO3\u591a\u5c11\u514b\uff1f\u6c42\u65510.1X20X106/2X1000\u52300.1X25X106/2X1000
\u53730.106\u514b\u52300.1325\u514b\u4e4b\u95f4
\u6240\u9700Na2CO3\u7684\u6469\u5c14\u8d28\u91cf\uff1a500 ml * 0.1000 mol/l = 0.0500mol Na2CO3\u7684\u6469\u5c14\u8d28\u91cf\uff1a23 * 2 + 12 + 16 *3\uff1d106 g/mol \u6240\u4ee5\u53d60.0500 mol * 106g/mol = 5.3g
你称取碳酸钠0.106g-101325g范围内的任意一个值。把碳酸钠配成溶液用0.1摩尔每升的盐酸滴定，根据消耗的盐酸量就可以计算称取的碳酸钠的重量。这样就计算出称量误差了。
绛旓細鎵闇Na2CO3鐨勬懇灏旇川閲忥細500 ml * 0.1000 mol/l = 0.0500mol Na2CO3鐨勬懇灏旇川閲忥細23 * 2 + 12 + 16 *3锛106 g/mol 鎵浠ュ彇0.0500 mol * 106g/mol = 5.3g
绛旓細鍗0.106鍏嬪埌0.1325鍏嬩箣闂
绛旓細浣犵О鍙栫⒊閰搁挔0.106g-101325g鑼冨洿鍐呯殑浠绘剰涓涓笺傛妸纰抽吀閽犻厤鎴愭憾娑茬敤0.1鎽╁皵姣忓崌鐨勭洂閰婊村畾锛屾牴鎹娑堣鐨勭洂閰搁噺灏卞彲浠ヨ绠楃О鍙栫殑纰抽吀閽犵殑閲嶉噺銆傝繖鏍峰氨璁＄畻鍑虹О閲忚宸簡銆
绛旓細鑽夐吀閽犺川閲忕害涓0.67g锝0.8375g 鍙嶅簲鏂圭▼寮:5Na₂C₂O₄锝2KMnO₄锛堥吀鎬ф潯浠讹級= 2Mn2+ 锛10CO₂锛8H2O锛岄渶瑕婊村畾楂橀敯閰搁捑閲忎负锛0.002锝0.0025mol锛屾牴鎹瀛愬弽搴旀柟绋嬪紡鍙煡闇瑕佽崏閰搁挔锛0.005锝0.00625mol锛屾墍浠ラ渶瑕佽崏閰搁挔璐ㄩ噺锛134g/mol脳0.005锝0.00625锛0...
绛旓細鎸夌収鍙嶅簲寮忓彲浠ヨ绠楀嚭鏉ョ殑锛2KMnO4+5Na2C2O4+16H+=2K++2Mn2++10CO2+8H2O+10Na+ 鑽夐吀閽犵殑鎽╁皵鏁颁负锛0.002- 0.0025mol锛屼笂涓嬮檺涔樹互鑽夐吀閽犵殑鎽╁皵璐ㄩ噺134锛屽緱鍒颁簡0.268-0.335鍏
绛旓細婊村畾鍙嶅簲锛歂a2CO3 + 2HCI 鈥斺 2NaCI + CO2 + H2O 1 2 m/105.6 0.1*20/1000 m=0.1056g 褰揤=25鏃讹紝璁＄畻鍑簃=0.132g 瑕佹兂娑堣鐩愰吀鐨勪綋绉湪20鈥25姣崌涔嬮棿锛岀О鍙栫⒊閰搁挔鐨勮川閲忚寖鍥存槸0.1056鈥0.132g銆
绛旓細鎽╁皵鐩愬寲瀛﹀紡(NH4)2Fe(SO4)2.6H2O锛屽弽搴斿氨鎸塊MnO4+5Fe锛圛I锛=Mn锛圛I锛+5Fe锛圛II锛夌畻灏卞ソ浜
绛旓細銆愯В鏋愩慛a2CO3 + 2HCl ===2NaCl + H2O + CO2(姘斾綋) 璁惧弽搴娑堣HCl Xmol 1 2 0.16/106 X ===>X=0.0030 鏃佹秷鑰桯Cl 0.003mol锛屾墍浠ラ渶瑕佺洂閰哥殑浣撶Н涓0.003mol梅0.1mol/L=0.03L=30ml 闇瑕30ml 0.1mol/L鐨勭洂閰搞傛晠閫塁 鍥炵瓟婊℃剰璇烽噰绾硚
绛旓細10mL 0.05mol?L-1鐨凬aOH婧舵恫涓姘㈡哀鍖栭挔鐨勭墿璐ㄧ殑閲=0.01L脳0.05mol/L=5脳10-4mol锛岀敱NaOH+HCl=NaCl+H2O鍙煡锛娑堣HCl鐨勭墿璐ㄧ殑閲=5脳10-4mol锛屾晠闇瑕佺洂閰哥殑浣撶Н=5脳10?4mol0.1mol/L=0.005l=5mL锛岃嫢閰稿紡婊村畾绠℃湭娑︽礂锛岀洂閰哥殑娴撳害鍋忎綆锛屾秷鑰楃洂閰镐綋绉亸澶э紝鍗冲浜5mL锛屾晠閫塁锛
绛旓細KHP鏄竴绉嶅父鐢ㄧ殑閰稿紡鐩愶紝鍏跺寲瀛﹀紡涓篕HC8H4O4銆傝姹傚湪婊村畾涓秷鑰0.1 mol/L NaOH 婧舵恫 25-30 ml锛屽彲浠ラ氳繃KHP鐨勬懇灏旇川閲忓拰婊村畾鍙嶅簲鐨勫寲瀛︽柟绋嬪紡鏉ヨ绠楁墍闇鐨勮川閲忋傞鍏堬紝鍖栧鏂圭▼寮忎负锛欿HC8H4O4 + NaOH 鈫 KNaC8H4O4 + H2O 璇ユ柟绋嬪紡琛ㄦ槑锛屽湪婊村畾杩囩▼涓紝姣1 mol鐨 KHC8H4O4 浼氫笌1 mol...
