chemistry HW

Chemistry 115

Activity 8b – Molarity

1- How many moles of NaOH are required to prepare 5.00 L of 0.025 M solution?

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2-What would be the molarity of a solution made by dissolving 4.50 g of KCl to make 250.0 mL solution?

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3- How many milliliters of 0.500 M solution can be prepared by dissolving 7.00 g of NaCl in water?

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4- How many grams of KBr would be recovered by evaporating 653 mL of 20.0 % KBr solution to dryness (d = 1.11 g/mL)?

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5- How many milliliters of 12.0 M HCl are needed to prepare 500.0 mL of 0.300 M HCl solution?

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6- A sample of potassium hydrogen oxalate, KHC2O4, weighing 0.832 g , was dissolved in water and titrated with 25.80 mL of NaOH solution. Calculate the molarity of NaOH solution.

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7- How many grams of HCl are in 100.0 mL of 12.0 M HCl solution?

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8- What is the molarity of sulfuric acid solution that is 59% H2SO4 by mass and has a density of 1.49 g/mL?

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9- According to the reaction equation:

H2SO4 + 2 NaOH → 2 H2O + Na2SO4

A 10.0 mL sample of the acid required 25.5 mL of 0.456 M NaOH for neutralization. Calculate the molarity of the acid.