1)Calculate the grams or milliliters of solute needed to prepare the following s

Question

1)Calculate the grams or milliliters of solute needed to prepare the following solutions.

65. g of a 8.0 % (m/m) KCl solution Answer should be in Grams.

1150 mL of a 3.0 % (m/v) NH4Cl solution Answer hould be in Grams

250. mL of a 20.0 % (v/v) acetic acid solution Answer in mL

Express your answer using three significant figures.

2)Calculate the final concentration of each of the following:

2.6 L of a 5.0 M HCl solution is added to water so that the final volume is 7.0 L . Cfinal = ? M

Water is added to 0.40 L of a 12 M NaOH solution to make 4.0 L of a diluted NaOH solution. Cfinal = ?M

A 15.0 mL sample of a 16 % (m/v) KOH solution is diluted with water so that the final volume is 120.0 mL . Cfinal = % (m/v)

A 75.0 mL sample of a 18 % (m/v) H2SO4 solution is added to water to give a final volume of 410 mL . Cfinal = % (m/v)

3) Calculate the final concentration of the solution when water is added to prepare each of the following solutions.

17.0 mL of a 15.0 %(m/v) K2SO4 solution is diluted to 80.0 mL Answer should be in % (m/v)

80.0 mL of a 6.00 M NaOH solution is diluted to 235 mL Answer should be in M

Explanation / Answer

Answer to question 1

1) To prepare a 65 g of 8 % (m/m) KCl solution

mass of KCl required = 0.08 x 65 = 5.2 g

2) To prepare a 1150 ml of 3 % (m/v) NH4Cl solution

mass of NH4Cl = 3 x 1150/100 = 34.5 g

3) To prepare 250 ml of 20 % (v/v) acetic acid solution

Volume of acetic acid = 20 x 250/100 = 50 ml

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