1. Complete and balance the following reactions:
(a) C5H5N(aq) + H2O(l)
(b) C5H5N(aq) + HCl(aq)
(c) Co2+(aq) + H2O(l)
(d) Ca(OH)2(aq) + HF(aq)
(e) H3PO4(aq) + CaI2(aq)
(f) NO2–(aq) + H2O(l)
(g) C6H5NH2(aq) + HOCl(aq)
2. What is the pH of a 0.0025 M solution of methylamine, CH3NH2, at 25 °C?
3. Indicate whether the following salts are acidic, basic, or neutral.
(a) NaNO3
(b) Ca(C2H3O2)2
(c) KHSO4
(d) Co(OH)2
(e) CsNO2
4. A buffer is prepared that is 0.50 M boric acid, H3BO3, and 0.40 M sodium dihydrogen borate.
(a) What is the pH of the buffer at 25 °C?
(b) 0.05 moles of perchloric acid is added to 1.0 L of the buffer prepared in part (a). What is the new pH?
5. Which is more soluble at 25 °C, lead fluoride or lithium phosphate?