Question

A stock solution of Red #3 with a concentration of 8×10−2 was used in an experiment. Calculate the concentration of Red #3 for the following procedure. 3.5 mL of Red #3 was added to 3.1 mL of bleach and 9.3 mL of water.

Answer 1

Hello,

You did not mention if the concentration was in molar, g/mL or any other unit. However, this is a fairly simple dilution problem.

Since 3.5 mL of the dye are mixed with 3.1 mL of bleach and 9.3 mL of water, the total volume of the system is
3.5+3.1+9.3 mL which is 15.9 mL. Now you have to use the formula

here C is the concentration and V is volume while i and f denote initial and final concentration and volume.

since 3.5 mL of dye are added so it should be like this

Now you have the concentration of dye in the final mix. I don't know if you are talking about some reaction or not since you did not mention it. If you want to do it, then you will have to tell me whether the dye concentration was in molar or other units and the concentration of bleach. I hope it helps.