Hydrochloric Acid Solution Calculations

This video tutorial demonstrates how to calculate the volume of concentrated hydrochloric acid (HCl) needed to prepare a 250 ml solution with a concentration of 1 mol/L. The process involves converting the volume to liters, calculating the required moles, converting moles to mass using molecular weight, and then converting mass to volume using density. The tutorial also covers adjusting the calculated volume based on the concentration percentage of the HCl solution. Safety tips for preparing chemical solutions are provided at the end.

What is the first step in preparing a 250 ml solution of hydrochloric acid?

• Convert the volume to liters

• Calculate the number of moles

• Determine the molecular weight

• Measure the density

How many liters are equivalent to 250 ml?

• 0.025 liters

• 0.25 liters

• 2.5 liters

• 25 liters

What is the concentration of the hydrochloric acid solution to be prepared?

• 0.5 mol per liter

• 1 mol per liter

• 2 mol per liter

• 1.5 mol per liter

How many moles are needed to prepare 250 ml of a 1 mol per liter solution?

• 2 mol

• 1 mol

• 0.5 mol

• 0.25 mol

What is the molecular weight of HCl used in the calculations?

• 38.5 grams

• 37.5 grams

• 36.5 grams

• 35.5 grams

How much mass of HCl is required for 0.25 mol?

• 11.125 grams

• 10.125 grams

• 9.125 grams

• 8.125 grams

What is the density of the concentrated HCl solution?

• 1.09 grams per ml

• 1.19 grams per ml

• 1.39 grams per ml

• 1.29 grams per ml

What volume of concentrated HCl is needed to get 9.125 grams of HCl?

• 6.67 ml

• 9.67 ml

• 8.67 ml

• 7.67 ml

What is the concentration percentage of the stock HCl solution?

• 27%

• 37%

• 47%

• 57%

How much of the stock solution is needed to prepare the final solution?

• 21.72 ml

• 20.72 ml

• 18.72 ml

• 19.72 ml