Question

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

5)Prepare a 1% alcoholic formalin solution using 10ml of a 10% formalin (CH2O) solution and absolute alcohol instead of water.Show Work:

Absolute alcohol =

Total Volume 1% alcoholic formalin =

6)Dilute 0.375ml of meth blue stock to 50mls. Calculate the percent solution.Show Work:

Percent Solution =

Answer 1

5)

10% of formalin solution means 10 g of formalin in 100 mL of alcoholic solution.

percentage of solution = mass of the compound/volume of the solution * 100

1% = 10/V*100

V = volume of the 1% solution = 1000 mL

if 100 mL of 10% solution is present then we have to add 900 ml alcohol to get 1% of solution.

But we have only 10 mL of 10% solution is present then we have to add 90 mL of Alcohol to get 1% of solution.

so add 90 mL of Alcohol to 10% of 10 mL of Formalin.

Total volume of 1% of Formalin solution = 100 mL

Volume of absolute alcohol = 90 mL

6)

Percent of solution = volume of the meth blie stock/total volume of the soltion * 100

Percent of solution = 0.375mL/50mL * 100

percent of solution = 0.75%