pract.quiz4 - B. Calcium sulfate 4. What is the...

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1. Which of the following mixtures gives a buffer with a pH greater than 7.0? For HCNO, K a = 2.2 × 10 –4 and for NH 3 , K b = 1.8 × 10 –5 . A. 10 mL of 0.1 M NH 3 (aq) + 10 mL of 0.1 M HCl(aq) B. 10 mL of 0.1 M HCNO(aq) + 10 mL of 0.1 M NaOH(aq) C. 10 mL of 0.1 M HCNO(aq) + 5.0 mL of 0.1 M NaOH(aq) D. 10 mL of 0.1 M NH 3 (aq) + 10 ml of 0.1 M HCNO(aq) E. 10 mL of 0.1 M NH 3 (aq) + 5.0 mL of 0.1 M HCl(aq) 2 . The K sp of AgCl is 1.6 x 10 -10 . What is the solubility of AgCl in 0.0010 M CaCl 2 ? Give your answer using scientific notation and to 2 significant figures (i.e., one decimal place). Answer Sodium sulfate crystals (Na 2 SO 4 ) are added to a 100 ml. solution containing the following concentrations of soluble cations: 0.02 mol·L 1 Ba 2+ (aq) and 0.01 mol·L 1 Ca 2+ (aq). 3 . The first precipitate to form will be _________ sulfate. A. Barium sulfate
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Unformatted text preview: B. Calcium sulfate 4. What is the concentration of sulfate ions in the solution when initial precipitation occurs? A. 2.4 10 3 molL 1 B. 5.5 10 9 molL 1 C. 1.1 10 10 molL 1 D. 2.0 10 2 molL 1 5 . Calculate the concentration of barium ions that remains in the solution when calcium ions start to precipitate. A. 4.6 10 8 molL 1 B. 2.4 10 3 molL 1 C. 2.4 10 5 molL 1 D. 1.0 10 2 molL 1 6. What is the sum of the coefficients when the charge balance equation is formed for CaCO3 in water? A. 4 B. 5 C. 6 D. 7 E. 8 7 . Which of the following solutions will generate a pH closest to 7? A. 0.00000001 M acetic acid B. 0.00000001 M HCl C. 0.000000001 M ammonia D. 0.00000001 M Ba(OH)2...
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pract.quiz4 - B. Calcium sulfate 4. What is the...

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