5 Determine the volume of H2O needed to dilute 15 mL of a 5.0% (m/v) solution to

Question

5 Determine the volume of H2O needed to dilute 15 mL of a 5.0% (m/v) solution to a final concentration of 3.5% (m/v). A. 12 mL B. 6 mL C. 100 mL D. 15 mL
6 Identify the solution with the lowest freezing point. A. 1.0 moles KOH in 3.0 L water B. 1.0 moles AlCl3 in 3.0 L water C. 1.5 moles CH3OH in 3.0 L water D. 1.5 moles NaCl in 3.0 L water
8 Which of the following solutions is not unsaturated? A. a sugar cube that completely dissolves when added to a cup of coffee B. a crystal added to a solution that does not change in size C. adding 25.0 g KCl to 100.0 g water D. adding 11.0 g NaNO3 to 25.0 g water
13 How many grams of KCl are needed to prepare 150. g of a 7.25% (m/m) solution? A. 10.9 g B. 4.83 g C. 13.8 g D. 20.7 g
14 How many milliliters of water must be added to 265 mL of a 1.75 M HCl solution to dilute it to 0.750 M, assuming the volumes are additive? A. 353 mL B. 114 mL C. 202 mL D. 618 mL 5 Determine the volume of H2O needed to dilute 15 mL of a 5.0% (m/v) solution to a final concentration of 3.5% (m/v). A. 12 mL B. 6 mL C. 100 mL D. 15 mL
6 Identify the solution with the lowest freezing point. A. 1.0 moles KOH in 3.0 L water B. 1.0 moles AlCl3 in 3.0 L water C. 1.5 moles CH3OH in 3.0 L water D. 1.5 moles NaCl in 3.0 L water
8 Which of the following solutions is not unsaturated? A. a sugar cube that completely dissolves when added to a cup of coffee B. a crystal added to a solution that does not change in size C. adding 25.0 g KCl to 100.0 g water D. adding 11.0 g NaNO3 to 25.0 g water
13 How many grams of KCl are needed to prepare 150. g of a 7.25% (m/m) solution? A. 10.9 g B. 4.83 g C. 13.8 g D. 20.7 g
14 How many milliliters of water must be added to 265 mL of a 1.75 M HCl solution to dilute it to 0.750 M, assuming the volumes are additive? A. 353 mL B. 114 mL C. 202 mL D. 618 mL 5 Determine the volume of H2O needed to dilute 15 mL of a 5.0% (m/v) solution to a final concentration of 3.5% (m/v). A. 12 mL B. 6 mL C. 100 mL D. 15 mL
6 Identify the solution with the lowest freezing point. A. 1.0 moles KOH in 3.0 L water B. 1.0 moles AlCl3 in 3.0 L water C. 1.5 moles CH3OH in 3.0 L water D. 1.5 moles NaCl in 3.0 L water 6 Identify the solution with the lowest freezing point. A. 1.0 moles KOH in 3.0 L water B. 1.0 moles AlCl3 in 3.0 L water C. 1.5 moles CH3OH in 3.0 L water D. 1.5 moles NaCl in 3.0 L water
8 Which of the following solutions is not unsaturated? A. a sugar cube that completely dissolves when added to a cup of coffee B. a crystal added to a solution that does not change in size C. adding 25.0 g KCl to 100.0 g water D. adding 11.0 g NaNO3 to 25.0 g water 8 Which of the following solutions is not unsaturated? A. a sugar cube that completely dissolves when added to a cup of coffee B. a crystal added to a solution that does not change in size C. adding 25.0 g KCl to 100.0 g water D. adding 11.0 g NaNO3 to 25.0 g water
13 How many grams of KCl are needed to prepare 150. g of a 7.25% (m/m) solution? A. 10.9 g B. 4.83 g C. 13.8 g D. 20.7 g 13 How many grams of KCl are needed to prepare 150. g of a 7.25% (m/m) solution? A. 10.9 g B. 4.83 g C. 13.8 g D. 20.7 g
14 How many milliliters of water must be added to 265 mL of a 1.75 M HCl solution to dilute it to 0.750 M, assuming the volumes are additive? A. 353 mL B. 114 mL C. 202 mL D. 618 mL 14 How many milliliters of water must be added to 265 mL of a 1.75 M HCl solution to dilute it to 0.750 M, assuming the volumes are additive? A. 353 mL B. 114 mL C. 202 mL D. 618 mL

Explanation / Answer

Ans 5 :

5.0% of 15 mL has 95% of water i.e. (95 x 15) / 100 = 14.25 mL and 15-14.25 = 0.75 mL of solute

3.5% of solution = (0.75 / V ) x 100

V = 21.43 mL

So the amount of water to be added = 21.43-14.25

= 7.18 mL

So the water to be added will be approx 6 mL

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