A student has 100. mL of 0.400 M M CuSO4(aq) and is asked to make 100. mL of 0.150 M CuSO4(aq) for a spectrophotometry experiment. The following laboratory equipment is available for preparing the solution: centigram balance, weighing paper, funnel, 10 mL beaker, 150 mL beaker, 50 mL graduated cylinder, 100 mL volumetric flask, 50 mL buret, and distilled water.

Calculate the volume of 0.400 M CuSO4(aq) required for the preparation

37.5 mL

Explanation:

To solve this problem we can use the formula:

C₁ = 0.400 M

V₁ = ?

C₂ = 0.150 M

V₂ = 100 mL

So now we solve for V₁:

So we need 37.5 mL of 0.400 M CuSO₄(aq) to make 100 mL of 0.150 M CuSO₄(aq). That volume could be measured in the 50 mL buret.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.