2. then students put the substance into a clean beaker distilled water and aqueous solution and then use litmus dipped in the solution to check the pH level. Middle and base of cleaner body.
2 Then the students put the material into a clean beaker with distilled water and the solution. Then use litmus paper dipped in a solution. To determine the acidity Mid and bass of cleaning the body.
2. Then the students put into a beaker add cleaning agent and the aqueous solution and distilled water ใช้กระดาษลิตมัส dipped in solution to determine the acidity. The middle and base of abluent body.