Question

Prepare each solution using listed ingredients. Pay attention to the solute andsolvent. Draw the NFPA for your final product according to the NFPA’s for each ingredient. Show your calculations.

3)Prepare a 5% light green solution with 2.5g of solute.Show Work:

Weight of light green =

Total Volume =

4)Prepare 50ml of 2% Congo red from a 10% Congo red solution.Show Work

:Water =

Volume of 10% Congo red =

Answer 1

3) Weight of green solution given = 2.5 g

we have to prepare 5% of solution,

5% of solution means 5 g of solute present in the 100 mL of solution

we have only 2.5 g of light green.

dissolve the 2.5 g of the compound in 50 mL of solution.

then percentage of solution will become 2.5/50*100 = 5%

Total volume of solution = 50 mL

4) 10% congo red solution means 10 g of Congo red in 100 mL solution

we have the formula % of solution = mass of the solution/volume of the solution * 100

2% = 10/V*100

V = volume of the solution = 1000/2 = 500 mL

so we have to add 400 mL of water to 100 mL of 10% of Congo Red solution to prepare 2% of solution.

2% COng red solution means 2 g of Congo red in 100 mL of solution

mass of Congo Red m is given by for 2% of 50 mL of Congo Red solution

2% = m/50 * 100

m = 1 g

then we will add 100 mL water to the above solution then,

2 g of Congo red in 200 mL of solition

i.e., 1g in 100 mL of solution or 2 g in 200 mL of solution

Volume of 10% of Congo red solution = 100 mL

Volume of water = 400 + 100 = 500 mL