Aqueous solutions of phosphoric acid and sodium nitrite are combined, and the fo

Question

Aqueous solutions of phosphoric acid and sodium nitrite are combined, and the following equilibrium is established. The equilibrium constant Kc for this reaction is greater than one. Based on this information, which of the following statements S correct? Phosphoric acid is a weaker acid than nitrous acid. Nitrous acid is a weaker acid than water. The nitrite anion is a weaker base than the hydrogen phosphate anion. The dihydrogen phosphate anion is a stronger acid than nitrous acid. Phosphoric acid is a stronger acid than nitrous acid. A 0.050 M solution of the weak acid HA has [H3,O+] = 3.77 Times 10-4 M. What is the Ka for the acid? 7.5 Times 10-3M 2.8 Times 10-6 M 7.0 Times 10-7 M 7.0 Times 10-8M 2.6 Times 10-11 M What is the value of Ka for the methylammoniumium ion CH3NH3+? Kb = 4.4 Times 10-4 4.4 Times 10-4 4.8 Times 10-6 4.4 Times 10-10 2.3 Times 10-11 4.4 Times 10-18. Which one of the following substances will give an aqueous solution of pH

Explanation / Answer

5)D

6)

Ph = -1/2 log(Ka*C)

3.42 = -1/2 log(Ka*0.05)

Ka = 2.8*10^-6 M

option B

7) Kw = Ka*Kb

Ka = 10^-14/4.4*10^-4

Kba= 2.3*10^-11

8)option B

9)A

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