Question

You need to prepare 250.0 mL of a 1.35 M HCl solution from a 2.00 M HCl stock solution.

Answer 1

Answer:

a. C. volumetric flask

b. B. Measure out x mL using a volumetric pipet

c. 168.75mL

d. B. Add the correct amount of stock solution then fill to the 250 mL mark with water.

Explanation:

• The volumetric flask is mainly used in analytical chemistry to contain standard solutions or to prepare dilutions of a certain concentration of a reagent.
• The volumetric pipette is used to deliver a given volume with greater precision and accuracy.
• To make a dilution, the formula C1*V1 = C2*V2 is used where C is the concentration of the solution, in this case of molarity. V is the volume of the solution in ml and terms 1 and 2 correspond to the concentrated and diluted solutions respectively.

$V2=\frac{1.35M*250mL}{2.00M} =168.75mL$