Preparing Dilute Hydrochloric Acid Solutions

This video tutorial from the 'Source of Skills' YouTube channel guides viewers on how to prepare a 5% solution from 37% hydrochloric acid (HCL). It begins with an introduction and a list of required materials, including hydrochloric acid, a measuring flask, distilled water, a pipette, and a funnel. The video explains the calculation needed to determine the volume of HCL required using the concentration formula C1V1 = C2V2. It then provides a detailed, step-by-step process for safely preparing the solution, emphasizing the importance of adding water before acid to prevent harm. The tutorial concludes with instructions on storing the prepared solution.

What is the main objective of the video?

• To prepare a 5% solution from 37% HCL

• To understand the history of HCL

• To learn about the properties of HCL

• To discuss the uses of HCL in industry

Which of the following is NOT required for the preparation?

• Hydrochloric acid

• Beaker

• Ming flask

• Sodium chloride

What is the formula used to calculate the required volume of HCL?

• D1 V1 = D2 V2

• M1 V1 = M2 V2

• P1 V1 = P2 V2

• C1 V1 = C2 V2

How much 37% HCL is needed to prepare the solution?

• 75 mL

• 100 mL

• 67.5 mL

• 50 mL

Why should hydrochloric acid not be added directly into the flask?

• It may cause a reaction with the flask

• It may harm the user or the flask

• It will evaporate quickly

• It will not mix properly

What is the first step in the preparation process?

• Pour HCL directly into the flask

• Add distilled water to the flask

• Mix HCL with sodium chloride

• Heat the flask

What should be done after adding the required volume of HCL to the flask?

• Store the solution in a dark place

• Add more HCL

• Add distilled water up to 500 mL

• Seal the flask immediately

What is the final concentration of the prepared solution?

• 50%

• 5%

• 37%

• 10%

Where can the prepared solution be stored?

• In a metal container

• Only in a glass container

• In a plastic bag

• In any bottle