Homework Help for Chemistry

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Chemistry is the science that deals with the structure, properties and transformations of the bodies based on their composition.

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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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