Hydrogen Questions and Answers

A sample of water is found to contains following dissolving salts in milligrams per litre Mg(HCO3)2 = 73, CaCl2 = 111, Ca(HCO3)2 = 81, MgSO4 = 40 and MgCl2 = 95. Calculate temporary and permanent hardness and total hardness.
Inorganic Chemistry
Hydrogen
A sample of water is found to contains following dissolving salts in milligrams per litre Mg(HCO3)2 = 73, CaCl2 = 111, Ca(HCO3)2 = 81, MgSO4 = 40 and MgCl2 = 95. Calculate temporary and permanent hardness and total hardness.
1) A 0.15 M aqueous solution of the weak acid HA at 25.0 °C has a pH of 5.35. The value of Ka for HA is A) 1.3 x 10^-10 B) 3.0 × 10^-5 C) 1.8 x 10^-5 D) 7.1 x 10^-9 E) 3.3 x 10^4
Inorganic Chemistry
Hydrogen
1) A 0.15 M aqueous solution of the weak acid HA at 25.0 °C has a pH of 5.35. The value of Ka for HA is A) 1.3 x 10^-10 B) 3.0 × 10^-5 C) 1.8 x 10^-5 D) 7.1 x 10^-9 E) 3.3 x 10^4
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