Print out the practice set Word RTF Print out the answers Word RTF
| 1. | What is the approximate pH of a solution that is: (you will need an indicator chart) | |||||||||||||||||||||||||||||||||
| a. | yellow in methyl red, yellow in phenol red, and yellow in alizarin yellow? | |||||||||||||||||||||||||||||||||
| between 6.0 and 6.6 | ||||||||||||||||||||||||||||||||||
| b. | yellow in methyl red, red in phenol red, and red in alizarin yellow? | |||||||||||||||||||||||||||||||||
| 12 or higher | ||||||||||||||||||||||||||||||||||
| 2. | Write the general word equation for a neutralization reaction. | |||||||||||||||||||||||||||||||||
| Acid + Base → Salt + Water | ||||||||||||||||||||||||||||||||||
| 3. | Write balanced neutralization reactions for the following: | |||||||||||||||||||||||||||||||||
| a. | the reaction between acetic acid, HC2H3O2 and potassium hydroxide, KOH | |||||||||||||||||||||||||||||||||
| HC2H3O2 + KOH → KC2H3O2 + H2O | ||||||||||||||||||||||||||||||||||
| b. | the reaction between nitric acid, HNO3 and calcium hydroxide, Ca(OH)2 | |||||||||||||||||||||||||||||||||
| 2 HNO3 + Ca(OH)2 → Ca(NO3)2 + 2 H2O | ||||||||||||||||||||||||||||||||||
| c. | the reaction between sulfuric acid, H2SO4, and sodium hydroxide, NaOH | |||||||||||||||||||||||||||||||||
| H2SO4 + 2 NaOH → Na2SO4 + 2 H2O | ||||||||||||||||||||||||||||||||||
| 4. | If 25.00 mL of a 0.100 M NaOH solution is required to neutralize 15.00 mL of a solution of HCl, what is the molarity of the acid? | |||||||||||||||||||||||||||||||||
Begin with a balanced equation: HCl + NaOH → NaCl + H2O The acid:base ratio is 1:1, therefore the formula used to calculate the unknown concentration is: MAVA = MBVB Determine the values for the known variables:
Substitute values into the formula MAVA = MBVB and solve for the unknown:
ANSWER: The concentration of the HCl solution is 0.167 M. |
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| 5. | What is the concentration of a calcium hydroxide solution, Ca(OH)2, if 30.00 mL of the base is completely neutralized by 10.0 mL of 0.0200 M HCl? | |||||||||||||||||||||||||||||||||
Write the balanced equation: 2 HCl + Ca(OH)2 → CaCl2 + 2 H2O The acid:base ratio is 2:1, therefore the formula used to calculate the unknown concentration is: MAVA = 2 MBVB Determine the values for the known variables:
Substitute values into the formula MAVA = MBVB and solve for the unknown:
ANSWER: The concentration of the Ca(OH)2 solution is 3.33 ×10-3 M.
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