1 . a .10 M solution of which of the following salts is most basic? a) LiNO3 b)

Question

1. a .10 M solution of which of the following salts is most basic?

a) LiNO3 b) Na2SO4 c) CaCl2 d) Al(NO3)3 e) K2CO3

2. What is the pH of the final solution when 25 mL of 0.025 M HCl has been added to 35 mL of 0.040 M HCl at 25°C?

A) 3.22 C) 1.47 E) 3.39 B) 1.78 D) 2.69

3. What is the hydroxide-ion concentration of a 0.240 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 5.6 10–2 and Ka2 = 5.1 10–5.

A) 2.910–12 M C) 3.510–3 M E) 1.010–7 M B) 8.610–14 M D) 1.110–13 M

4. What is the equilibrium concentration of H2C2O4 in a 0.230 M oxalic acid, H2C2O4, solution? For

oxalic acid, Ka1 = 5.6 10–2 and Ka2 = 5.1 10–5.

A) 1.410–1 M C) 2.310–1 M

B) 1.110–1 M D) 5.110–5 M

5. A solution of aniline (C6H5NH2, Kb = 4.2 10–10) has a pH of 8.75 at 25oC. What was the initial concentration of anilline?

A) 1.810–9 M C) 7.710–2 M E) 5.610–6 M

B) 9.310–9 M D) 4.210–10 M

6. Which of the following salts will produce an acidic solution when added to pure water?

A) Cs2CO3 C) KCN E) Li2S B) NaF D) Al(NO3)3

7. Which of the following salts is most likely to form an aqueous solution having the pH shown in the figure

the pH in the picture is 4.55

A) NH4Cl C) K2CO3 E) LiNO3 B) NaBr D) RbCN

Explanation / Answer

1.)

Answee : e) K2CO3

reason : this is the salt of strong base and weak acid. so pH > 7 . so this is most basic.

LiNO3 , Na2SO4 , CaCl2 , these all are neutral salts. because these are salt of strong acid and strong bases.

2)

[H+] = M1 V1 + M2 V2 / V1 + V2

        = 25 x 0.025 + 35 x 0.040 / 25 + 35

      = 0.03375 M

pH = -log [H+] = -log (0.03375)

pH = 1.47

Answer : C) 1.47

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