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18 Dec 2019

Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KOHrequired for precipitation to begin in each case.

Part A

1.1×10−2 M CaCl2

Express your answer using two significant figures.
[KOH] = M

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Part B

2.8×10−3 M Fe(NO3)2

Express your answer using two significant figures.
[KOH] = M

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31 Dec 2019

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Related questions

Part A

0.15M NaCN.

Express your answer using two significant figures.
[OH?] =

2.82

 M

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Part B

Express your answer using two decimal places.
pH =

9.7

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Part C

8.2

Part A

Calculate the pH and the concentrations of all species present in 0.16 M H2SO3. (Ka1 = 1.5×10−2, Ka2 = 6.3×10−8)

Express your answer to three significant figures and include the appropriate units.
pH =

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Part B

Calculate the concentration of H2SO3 in solution.

Express your answer to two significant figures and include the appropriate units.

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Part C

Calculate the concentration of HSO−3 in solution.

Express your answer to two significant figures and include the appropriate units.

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Part D

Calculate the concentration of H3O+ in solution.

Express your answer to two significant figures and include the appropriate units.

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Part E

Calculate the concentration of SO2−3 in solution.

Express your answer to two significant figures and include the appropriate units.

Problem 3.63

Several brands of antacids use Al(OH)3 to react with stomach acid, which contains primarily HCl: αAl(OH)3(s)+βHCl(aq)→γAlCl3(aq)+δH2O(l)

Part A

Balance this equation.

Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

Al(OH)3+3HCl→AlCl3+3H2O

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Part B

Calculate the number of grams of HCl that can react with 0.490 g of Al(OH)3.
m =

.77

 g

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Part C

Calculate the number of grams of AlCl3 formed when 0.490 g of Al(OH)3 reacts.
m =

0.34

 g

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Part D

Calculate the number of grams of H2O formed when 0.490 g of Al(OH)3 reacts.
m =

.77

 g

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Problem 4.71

Indicate the concentration of each ion or molecule present in the following solutions.

Part A

0.25 M NaNO3

Express your answer numerically using two significant figures. If there is more than one answer, separate them by a comma.

0.25,0.25

 M

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Part B

1.7×10−2M MgSO4

Express your answer numerically using two significant figures. If there is more than one answer, separate them by a comma.

1.3,1.3

 M

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Part C

2.00×10−2M C6H12O6

Express your answer numerically using three significant figures. If there is more than one answer, separate them by a comma.
M

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Part D

A mixture of 45.0mL of 0.272M NaCl and 65.0mL of 0.0247M (NH4)2CO3. Assume that the volumes are additive.

Express your answer numerically using three significant figures. If there is more than one answer, separate them by a comma.

0.0146,0.111,0.0292,0.0146

 M

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Problem 4.73

Part A

You have a stock solution of 16.0 M NH3. How many milliliters of this solution should you dilute to make 1250 mL of 0.280 M NH3?
V = mL

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Part B

If you take a 10.0-mL portion of the stock solution and dilute it to a total volume of 0.450 L , what will be the concentration of the final solution?
M =

0.022

 M

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