称取工业纯碱(混合碱)试样0.8983g,加酚酞指示剂,用0.2896mol·L-1HCl溶液滴定至终点,耗去HCl溶液31.45mL。再加甲基橙指示剂,滴定至终点,又耗去24.10mL盐酸。求试样中各组分的质量分数。
第2题
某一元弱酸(HA)纯品1.250g,用水溶解后定容至50.00mL,用41.20mL0.0900mol·L-1NaOH标准溶液滴定至化学计量点。加入8.24mL NaOH溶液时,溶液pH为4.30。求:
(1)弱酸的摩尔质量
(2)弱酸的解离常数
(3)化学计量点的pH
(4)选用何种指示剂
第3题
Calculate the equilibrium concentration of sulfide ion in a saturated solution of hydrogen sulfide to which enough hydrochloric acid has been added to make the hydronium ionconcentration of the solution 0.1mol·L-1at equilibrium. (A saturated H2S solution is0.10mol·L-1in hydrogen sulfide).
第4题
Calculate the hydroxide ion concentration,the percent reaction,and the pH of a 0.050mol·L-1solution of sodium acetate. (For acetic acid,).
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