Analyzing and Purifying Water: Required Practical Activities in Chemistry

The video tutorial covers a series of experiments to analyze and purify water. It begins with measuring the mass of dissolved salts in seawater using an evaporating basin. The concentration of salts is calculated by comparing the mass before and after evaporation. The tutorial also explains how to determine the pH of water samples using a pH meter or universal indicator solution. Finally, it demonstrates the distillation process to obtain potable water, highlighting the importance of low salt concentration and appropriate pH levels.

What is the first step in determining the mass of dissolved salts in seawater?

• Cooling the evaporating basin

• Adding universal indicator

• Measuring the mass of the evaporating basin

• Heating the seawater

How is the concentration of dissolved salts calculated?

• By multiplying the mass of dissolved salts by the volume of seawater

• By dividing the mass of dissolved salts by the volume of seawater

• By subtracting the mass of dissolved salts from the volume of seawater

• By adding the mass of dissolved salts to the volume of seawater

Which tool can be used to determine the pH of a water sample accurately?

• A thermometer

• A pH meter

• A distillation apparatus

• A balance

What is the purpose of the delivery tube in the distillation setup?

• To transfer steam to the boiling tube

• To add universal indicator

• To measure the pH

• To heat the seawater

What indicates the effectiveness of distillation in obtaining potable water?

• High concentration of dissolved salts

• Low concentration of dissolved salts and pH between 6.5 and 8.5

• High pH and high concentration of dissolved salts

• Low pH and high concentration of dissolved salts