For each of the following mass/volume solutions, show the calculation (equation

Question

For each of the following mass/volume solutions, show the calculation (equation with all units) for the preparation of each solution. Then, describe how you would make the solution in an appropriate container. 25 mL of 2.5 g/mL NaCl solution 10 mL of 50 mg/mL CuSO_4 solution 2 L of 0.5 g/mL dextrose solution 100 mL of 0.005 g/mL NaOH solution Express the following % mass/volume concentrations in g/mL units: 10% NaOH: g/mL NaOH 5% CuSO_4: g/mL CuSO_4 1.25% gelatin: g/mL gelatin For each of the following % mass/volume solutions, show the calculation (equation with all units) for the preparation of each solution. Then, describe how you would make the solution in an appropriate container. 40 mL of 3% CuSO_4 solution 200 mL of 8% NaCl solution 0.75 L of 5% dextrose solution

Explanation / Answer

1)

a.25ml of 2.5gr/ml NaCl solution

volume desired * concentration desired = mass of solute needed

25 * 2.5 = 62.5 grams to be dissolved in 25 ml of water

b.

10ml of 50mg/ml of CuSO4 solution

volume desired * concentration desired = mass of solute needed

10 * 0.05 gr/ml = 0.5gr to be added to 10ml of the water.

c.

2Lit of 0.5g/ml dextrose solution

volume desired * concentration desired = mass of solute needed

2000 ml * 0.5 g/ml = 1000 grams to be added to 2lit of water

d.

100ml of 0.005 g/ml of NaOH solution

volume desired * concentration desired = mass of solute needed

100ml * 0.005 = 0.5 gr to be added to 100ml of water.

2)

a.

10% NaOH solution means 10grams of NaOH is dissolved in 100ml of the solution

for 1ml, the weight to be present = 10 / 100 = 0.1g/ml

b.

5% CuSO4 solution means; 5gr of CuSO4 is dissolved in 100ml of the solution

then for 1ml, the weight to be present = 5/100 = 0.05 g/ml

c.

1.25% gelatin means; 1.25 grams of gelatin is dissolved in 100 ml of the solution

then for 1ml, the weight to be present = 1.25/100 = 0.0125 g/ml

3.

A. 40 ml of 3% copper sulphate solution

volume desired * concentration desired = mass of solute needed

40ml * 0.03gr / ml = 1.2 grams

ie.,, 1.2 grams of coppersulphate to be added to 40ml of water.

B.

200ml of 8% NaCl solution

volume desired * concentration desired = mass of solute needed

200 * 0.08g/ml = 16gr

i.e., 16gr of NaCl is dissolved in 200ml of water.

C.

0.75lit i.e., 750ml of 5% dextrose solution

volume desired * concentration desired = mass of solute needed

750ml * 0.05 gr/ml = 37.5 gr

i.e., 37.5 gr is to be dissolved in 750 ml of the solution

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