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23 Cards in this Set
- Front
- Back
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Magnesium hydroxide is a slightly soluble substance. If the pH of a saturated solution of Mg (OH)2 is 10.49 at 25° C, calculate Ksp for Mg (OH)2. |
1.5 x 10^-11 |
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Which statement about solubility product constant, Ksp, is false? |
The solubility product expression is the product of the concentration of the compound's constituent ions. |
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Calculate the concentrations of H3O+ and OH- ions in a .25 M HClO4 solution. |
[H3O+] = .25 M, [OH] = 4.0 x 10^-14 M |
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A .10 M solution of which of the following salts is neutral? |
NH4CH3COO |
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Calculate the pH of .05 M benzoic acid solution. Ka = 6.3 x 10^-5 |
2.75 |
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Which solution would have the lowest [OH-]? |
.5 M HCl |
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We make a 1.0 M solution of an unknown acid, HX. With a pH meter, we determine that the pH of the solution is 4.0. Which of the following statements about the HX is true? |
HX is a weak acid with a Ka value of about 10^-8 |
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Calculate the pH of .14 M NaF solution? |
8.14 |
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Calculate the pH of .15 M Co(NO3)2. For [Co(OH2)6]2+ , Ka = 5.0 x 10^-10 |
5.06 |
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What is the [H3O+] in .4 M NaCN solution? |
3.2 x 10^-12 |
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Calculate the pH in a .025 M Ba(OH)2 solution. |
12.70 |
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Calculate the hydrolysis constant for the ammonium ion, NH4+ |
5.6 x 10^-10 |
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Which of the following statements about titration curves is false? |
The end point on a titration curve is the point where chemically equivalence amounts of acid and base have reacted. |
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The nonionized firm of an acid indicator is yellow, and its anion is blue. The Ka of this indicator is 10^-6 what will be the approximate pH range over which this indicator changes color? |
5-7 |
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Calculate the pH of a solution resulting from the addition of 20 mL of .1 M HCl to 50 mL of .1 M NH3. |
9.44 |
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Consider the titration curve describing the titration of a strong acid by the addition of a strong base. Which of the following statements is false? |
The pH is lower at the end of the titration than at the beginning. |
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A buffer is prepared using .085 M formic acid and .085 M sodium formate. Which of the following statements is false? |
The formate ion can neutralize bases added to the buffer. |
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A solution that is .2 M in NH3 is also .3 M in NH4Cl. What is the [OH-] in this solution? |
1.2 x 10^-5 |
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Calculate the solubility product constant for aluminum hydroxide. Its molar solubility is 2.9 x 10^-9 mole per liter at 25°C. |
1.9 x 10^-33 |
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How many grams of Mn(OH)3 will dissolve in 1350 mL of water at 25° C? |
6.3 x 10^-8 g |
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The Ksp for Zn3(AsO4)2 is 1.1 x 10^-27 When 100 mL of 5.5 x 10^-4 M Zn2+ is mixed with 50 mL of 1m2 x 10^-4 M AsO4 3- which of the following statements is true? |
A precipitate forms because Qsp > Ksp. |
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In a strong acid / weak bade titration curve, the vertical portion around the equivalence point is shorter than in a strong acid / strong base titration curve, so many indicators would not be suitable for accurately determining the equivalence point. Which of the following indicators would be the best choice: |
Chlorophenol red, yellow to red, pH 4.8-6.4 |
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How many grams of BaCO3 will dissolve in 853 mL of .15 M BaCl2? |
9.1 x 10^-6 |
