将58点五克氯化钠溶于水配成250毫升溶液计算氯化钠的量浓度
\u628a28.4\u514b\u786b\u9178\u94a0\u6eb6\u4e8e\u6c34\u914d\u6210250\u6beb\u5347\u6eb6\u6db2\uff0c\u8ba1\u7b97\u6eb6\u6db2\u4e2d\u6eb6\u8d28\u7684\u7269\u8d28\u7684\u91cf\u6d53\u5ea6\uff1f\u5e76\u6c42\u51fa\u6eb6\u6db2\u4e2d\u94a0\u79bb\u5b50\u7684\u6570\u76ee\uff1f\u786b\u9178\u94a0\u7684\u7269\u8d28\u7684\u91cf=28.4g\u00f7142g/mol=0.2mol
\u7269\u8d28\u7684\u91cf\u6d53\u5ea6=0.2mol\u00f70.25L=0.8mol/L
\u6bcf\u4e2a\u786b\u9178\u94a0\u5206\u5b50\u4e2d\u542b\u4e24\u4e2a\u94a0\u79bb\u5b50\uff0c\u6240\u4ee5\u94a0\u79bb\u5b50\u6570\u76ee=0.2mol\u00d72=0.4mol
\u786b\u9178\u94a0\u7684\u76f8\u5bf9\u5206\u5b50\u91cf\u4e3a142\uff0c28.5g\u786b\u9178\u94a0\u7269\u8d28\u7684\u91cf\u4e3a
28.5\u00f7142\uff1d0.2mol
250\u6beb\u5347\u53730.25\u5347\uff0c\u6240\u4ee5\u6eb6\u6db2\u4e2d\u786b\u9178\u94a0\u7684\u7269\u8d28\u7684\u91cf\u6d53\u5ea6\u4e3a
0.2/0.25\uff1d0.8M
1\u5206\u5b50Na2SO4\u75312\u4e2a\u94a0\u79bb\u5b50\u548c1\u4e2a\u786b\u9178\u6839\u79bb\u5b50\u7ec4\u6210\uff0c\u6240\u4ee528.5g\u786b\u9178\u94a0\u542b\u6709\u94a0\u79bb\u5b50\u7269\u8d28\u7684\u91cf\u4e3a
0.2\u00d72\uff1d0.4mol
\u5219250\u6beb\u5347\u786b\u9178\u94a0\u6eb6\u6db2\u4e2d\u94a0\u79bb\u5b50\u7269\u8d28\u7684\u91cf\u6d53\u5ea6\u4e3a
0.4/0.25\uff1d1.6M
\u542b\u6709\u786b\u9178\u6839\u79bb\u5b50\u7269\u8d28\u7684\u91cf\u4e3a
0.2\u00d71\uff1d0.2mol
\u6240\u4ee5\u6eb6\u6db2\u4e2d\u786b\u9178\u6839\u7269\u8d28\u7684\u91cf\u6d53\u5ea6\u4e3a
0.2/0.25\uff1d0.8M
绛旓細5(g)/58.5(g/mol)=1mol锛58.5g姘寲閽犳憾娑1kg姘翠腑锛屽叾婧舵恫鐨勬昏川閲弇鎬=58.5g+1000g=1058.5g=1.0585kg 璐ㄩ噺鎽╁皵娴撳害鍗充竴瀹氳川閲忔憾娑蹭腑鎵鍚湁鐨勮鐗╄川鐨勭墿璐ㄧ殑閲忎篃鍗充竴瀹氳川閲忔憾娑蹭腑鎵鍚湁鐨勮鐗╄川鐨勬懇灏旀暟銆傚洜姝よ姘寲閽犳憾娑茬殑璐ㄩ噺鎽╁皵鏁板氨鏄1mol/1.0585kg=0.945mol/kg ...
绛旓細NaCl鐨勫紡閲忥紳23+35.5=58.5 NaCl鐨勬懇灏旇川閲忥紳58.5g/mol n(NaCl)锛50.5g梅58.5g/mol鈮0.86mol V锛0.86mol梅0.2mol/L锛4.3L 绛旓細灏50.5鍏嬫隘鍖栭挔閰嶆垚4.3鍗囨憾娑插叾娴撳害涓0.2鎽/鍗囥(濡傛灉棰樼洰鏄細灏58.5鍏嬫隘鍖栭挔鈥︹︼紵绛旀鏄5鍗)
绛旓細浣嗙敱浜庣敓鎴愪簡姘斾綋锛屾墍浠ュ彧鏈11.4-4.4=7g 鍙樻垚浜嗘憾娑茬殑涓閮ㄥ垎锛夌█鐩愰吀鐨勬昏川閲忎负7.3/7.3%=100g 鑰屾憾娑叉昏川閲忎负100+7=107g 鍙嶅簲鍚庣殑婧舵恫涓殑婧惰川鍙湁NaCl 纰抽吀閽犲拰鐩愰吀鍙嶅簲鐨0.2mol NaCl 鍔犱笂鍘熸湰灏辨湁鐨凬aCl 姘寲閽鐨勬昏川閲忎负58.5*0.2+11.4-10.6=12.5g c%=12.5/107=11.7 ...
绛旓細58.5鍏脳0.1脳0.4=2.34鍏嬨傝绉板彇鍥轰綋姘寲閽2.34鍏嬨2.34鍏嬭姹傛槸鐧惧垎涔嬬櫨鐨勩
绛旓細杩欐槸閿欒鐨勶紝鍥犱负姘寲閽犳憾浜100姣崌姘翠腑锛屾憾娑蹭綋绉竴瀹氬ぇ浜100姣崌锛屽氨鐩稿綋浜庢按鍔犲浜嗭紝杩欐牱浼氫娇婧舵恫灏忎簬1.0mol/L
绛旓細閰嶅埗閰嶅埗0.1mol/L姘寲閽犻渶瑕佹隘鍖栭挔5.85g锛屽苟鍔犲叆1000ml鐨勬按杩涜婧惰В鍗冲彲閰嶆垚銆傝В锛氬凡鐭ユ隘鍖栭挔鐨勬懇灏旇川閲忎负58.5g/mol锛岄偅涔堝綋婧舵恫浣撶Н涓篤L鏃讹紝姘寲閽犵殑鎽╁皵娴撳害涓0.1mol/L鏃讹紝鍙緱婧舵恫涓隘鍖栭挔鐨勮川閲弇=0.1mol/L*VL*58.5g/mol=5.85Vg銆傚洜姝ら厤缃1L鎽╁皵娴撳害涓0.1mol/L鐨姘寲閽犳憾娑叉椂锛屾墍...
绛旓細姝ら鍙兘绠楀嚭鐗╄川鐨勯噺娴撳害銆俷NaCI=4.5/58.5=0.077mol cNaCI=0.077/500X1000=0.154mol/L 绛:灏4.5g鐨姘寲閽犳憾浜庢按涓紝閰嶆垚500ml鐨勬憾娑诧紝鐗╄川鐨勯噺娴撳害涓0.154mol/L.2mEq/ml姘寲閽犳祿搴︽槸澶氬皯 璇疯缁嗙殑鎻忓彊闂
绛旓細涓鐢熺殑姘存憾浜8.5鍏鐨姘寲閽锛屾诲叡涔熸槸閰嶆垚涓鍗囩殑鐢熺悊鐩愭按
绛旓細(1)n锛NaCl)=m/M=117/58.5mol=2mol c锛圢aCl)=n/V=2/1mol/L=2mol/L c锛圕l-)=c锛圢aCl)=2mol/L (2)鐢1绠楀嚭璇ユ憾娑茬墿璐ㄧ殑閲忔祿搴︿负2mol/L 鏍规嵁NaCl瀹堟亽锛屾墍浠 绋婧舵恫浣撶Н*閲忔祿搴=娴撴憾娑蹭綋绉*閲忔祿搴 0.5L * 1mol/L = X * 2mol/L X=0.25L (3)鍘熸憾娑蹭腑Cl-閲忔祿搴︿负2mol/...
绛旓細n=m/M=11.7g/58.5g/mol=0.2mol c=n/V=0.2mol/0.2L=1mol/L 鐢辩█閲婂畾鐞哻1V1=c2V2鏈 1mol/L*50mL=C2*500mL 寰桟2=0.1mol/L
