CHEM 3 LAB REPORT 2~<1> ()IJARTER Expt 4: Rei alive J\cid-Bnse strength of the h_nlro-;ides or the J'd row ckmcrn~; Group II· ----~--- Leader: --·----·

Objectives:

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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 mi. 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 phenolphtl1alein indicator and note any color change, 4. To sample 3 of each solution, add one drop of methyl orange indicator an~ note any color change. 5. To each sample 1 of solution B. C, and D, add 10 to 20 drops of 6M HCI dropwise. shaking occasionally.

Note any change in tile test tube contents and in the pH paper inside. 6. To each sample~ of solution 8, C, and 0, add 10 to 20 drops of 6M NaOH dropwise, shaking occasionally.

Note any change in the solution and in the color of phenolphthalein inside the test tube

~~~~-+--~~--4--!Ld----+--~~~ rtd

~~~~~-~--~--~~---r~t~~----~~~· _, ;i ---.--------------- -~---. ----------

Questions:

1. Write the equation for the reaction between water and hydroxide of (a) a metallic elemeni.(MOH) and (b) a nonmetallic element {NOH) in period IlL

2. Write the equation for the reaction between water and each of !he following: Na,O, MgO, and P4010.

3. Write the equation for each reaction in procedure 5 and 6 ..

4. Which hydroxides are basic? Acidic? Amphoteric? Relate the respective proper1ies with their corresponding positio·n in periorllll.

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/ CHEM3 LAO RE.PORT 2h1

J QUARTER Expt 4: Relative Aciti-Bn~c strength of the hydro'\iJcs of the ]'d row clements Group fl: _ _J,.__ Leader: __ _

5. Deduce the relative strength of the -0-H bond in ·a'::idic and basic hydroxides of the third row elements.

6. Show tl1e special arrangement of atoms in hydroxides of phosphorus, sulfur and chlorine, using Lewis structures.

Synthesis:

References: