Expt 4: Relative Acid-base Strength Of The Hydroxides Of The

Expt 4: Relative Acid-Base strength of the hydroxides of the 3rd row elements Data Sheet

C30910

Objective:  _______________________________________________________________________ 

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Procedure 1. Place in small separate test tubes samples of each solution having the following volumes: Sample 1, 2.0 ml; Sample 2, 1.0 ml; Sample 3, 1.0 ml. 2. To the sample 1 of each solution, place a piece of pH paper and determine its pH by comparison with pH scale. 3. To sample 2 of each solution, add one drop of phenolphthalein indicator and note any color change. 4. To sample 3 of each solution, add one drop of methyl orange indicator and note any color change. 5. To each sample 1 of solution B, C, and D, add 1 to 2 ml of 6M HCl dropwise, shaking occasionally. Note any change in the test tube contents and in the pH paper inside. 6. To each sample 2 of solution B, C, and D, add 1 to 2 ml of 6M NaOH dropwise, shaking occasionally. Note any change in the solution and in the color of phenolphthalein inside the test tube.

Data: Salt Solution NaOH Mg(OH)2 Al(OH)3 SiO2nH2O PO(OH)3 SO2(OH)2 ClO3(OH)

Phenolph- thalein

Methyl orange

pH

6M HCl

6M NaOH