(1) m = 2.0
开始3次每次加入10克稀盐酸,固体质量减少1.0克.
(2) 85%
碳酸钙质量:4.0 - 0.6 = 3.4 g; 3.4/4.0 = 0.85 = 85%
(3) 7.3%
每10克稀盐酸和1克碳酸钙反应
CaCO3 + 2HCl = CaCl2 + H2O + CO2↑
100 2*36.5
1 x
x = 0.73 g
稀盐酸中溶质的质量分数:0.73/10 = 0.073 = 7.3%
(1) m = 2.0
开始3次每次加入10克稀盐酸,固体质量减少1.0克.
(2) 85%
碳酸钙质量:4.0 - 0.6 = 3.4 g; 3.4/4.0 = 0.85 = 85%
(3) 7.3%
每10克稀盐酸和1克碳酸钙反应
CaCO3 + 2HCl = CaCl2 + H2O + CO2↑
100 2*36.5
1 x
x = 0.73 g
稀盐酸中溶质的质量分数:0.73/10 = 0.073 = 7.3%