CHEMISTRY 1 172 QUIZ 3 NAME: DATE Multiple Choice Identify the choice that best

Question

CHEMISTRY 1 172 QUIZ 3 NAME: DATE Multiple Choice Identify the choice that best completes the statemnt or ansvers the question. Also, you must shote waork to receiove ANY credit 1) Seleet the pair of substances that is not a conjugate acid-base pair A) HNO2. NOz B) H2S, s2- C) H2SO4, HSO4- D) NH3, NH2 E) Hjo*, H20 2) Which of the following aqueous systems has the highest pH? 2) A) 0.1 A/HA, pAs-4.55 B) 0.1 MHA, pAs-11.89 C) 0.1 MHMO, pAs- 8.23 D) pure water E 0.1 MHBO, pki-243 3) What is the maximum mass of KCI that can be added to 1.OL of a 0.010 M lead I) 3) chloride solution without causing any precipitation of lead(II) chloride? Assume that addition of KCI does not affect the solution volume. For lead(lI chloride, Asp-1.6x 10-5 A) 0.2g D) 1.0g E) 3.0 g C) 1.5g 4) What is the pH of a buffer that consists of 0.20 A/NaH2P04 and 0.40 A/NazHPO4?) C) 8.13 5) A 10.0-mL sample of 0.75 /CH CH2COOH is titrated with 0.30 M/NaOH. What is the 5) C) 4.02 B) 0.8 g 4 6.2 x 10-8 B) 7.90 For NaH2PO4, A A) 7.51 D) 6.51 E) 6.91 pH of the solution after 22.0 mL of NaOH have been added to the acid? A 1.3x 10-5 E) 3.95 A) 4.83 B) 4.94 D) 5.75 6) 6) When a strong acid is titrated with a strong base, the pH at the equivalence point A) is less than 7.0, but is not 3.5 B) is equal to the pAg of the acid. C) is equal to 3.5. D) is equal to 7.0. E) is greater than 7.0.

Explanation / Answer

1. In conjugate acid -base pair always one is acid and one is base , and their is difference of only one proton in their formula.In this answer is B. because if H2S is acting as acid then its conjugate base is HS-. rest all are pair of conjugate acid base pair.

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