Question

A chemist from the laboratory of an industry dedicated to the manufacture of anticorrosive pigments and paints requires preparing a solution of potassium dichromate (K2Cr2O7) at 6.5% (m/v) to perform some tests. Indicate step by step the procedure for its preparation.

Answer 1

To prepare a 6.5% (m/v) solution of potassium dichromate, weigh 6.5 grams of it and dissolve it in enough water to make a 100 mL solution.

Step-by-step explanation:

To prepare a solution of potassium dichromate (K2Cr2O7) at 6.5% (m/v), follow these steps:

1. Weigh 6.5 grams of potassium dichromate using a balance calibrated in grams.
2. Dissolve the weighed potassium dichromate in enough water to make a total solution volume of 100 mL.
3. Mix the solution thoroughly to ensure the potassium dichromate is evenly distributed.

The resulting solution will have a concentration of 6.5% (m/v) potassium dichromate.