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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 0.0052 M solution of methylamine, CH3NH2, at 25 °C?



3. Indicate whether the following salts are acidic, basic, or neutral (circle the answer).

(a) NaNO3

Acid

Base

Neutral

(b) Ca(C2H3O2)2

Acid

Base

Neutral

(c) KHSO4

Acid

Base

Neutral

(d) Co(OH)2

Acid

Base

Neutral

(e) CsNO2

Acid

Base

Neutral



4. A buffer is prepared that is 0.40 M boric acid, H3BO3, and 0.50 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, magnesium fluoride or lithium phosphate?