Question

1)

In 1 L of Mannitol Salt Agar there are 75 g of sodium chloride. Convert this to a weight over volume percentage (%_w/v) and report your answer rounded to two decimal places. Do not include units in the answer block.

Percent weight over volume (%_w/v) is the weight of the solute in grams divided by the volume of the solvent in mL times 100. It is essentially expressing the grams of solute per 100 mL of solvent.

2)

In 1 L of Eosine Methylene Blue Agar there are 0.4 g of Eosin Y. Convert this to a weight over volume percentage (%_w/v) and report your answer rounded to two decimal places. Do not include units in the answer block.

Percent weight over volume (%_w/v) is the weight of the solute in grams divided by the volume of the solvent in mL times 100. It is essentially expressing the grams of solute per 100 mL of solvent.

3)

In 1 L of MacConkey Agar there are 5 g of Sodium Chloride. Convert this to a weight over volume percentage (%_w/v) and report your answer rounded to two decimal places. Do not include units in the answer block.

Percent weight over volume (%_w/v) is the weight of the solute in grams divided by the volume of the solvent in mL times 100. It is essentially expressing the grams of solute per 100 mL of solvent.

Answer 1

QUESTION 1 QUESTION 3 75 g of sodium chloride → 5g of Sodium Chloride 1 L Mannitol Agar In 0.1 L (100 ml) 1 L MacConkey Agar In 0.1 L (100 ml) → X - X 0.1 Lx758 -75 0.1 Lx5 g = 0.5 1 L 1L 0.5 grams 7.5 grams — x 100% = 7.5 % w/v 100 mL 100 ml * 100% = 0.5 % w/v QUESTION 2 1 L Eosin Methylene – In 0.1 L (100 ml) → 0.4 g of Eosin Y → X 0.1 Lx0.4 8 -0,04 grams 11 0.04 grams 100 mL - x 100% = 0.04 % w/v ^