Categories

# Volumetric Analysis

Before using this website, you must read our disclaimer here.

CONTENT

• Calculation Based on Percentage Purity and Impurity of substances.
• Percentage/amount of water of crystallization,
• Molar mass of the acidic base
• Solubility of substances
• Volume of gases
• Mole ratio of acid to base

## Volumetric Analysis

Volumetric analysis involves acid base titration.

Mole Ratio

Mole ratio is the ratio of the reacting species.  This determines the ratio of the acid that would react with the base.

Examples are

1.          H2SO4  +  2NaOH         →               Na2SO4 + 2H2O

CaVa   =  ½

CbVb

2.         2HCl +  Na2CO3         →     2NaCl +H2O + CO2

CaVa / CbVb =    2/1

EVALUATION

1. What is volumetric analysis
2. Give the ratio of the reaction species in the following chemical reactions

a.   CaCO3 + 2 HCl →        CaCl2     +   H2O    +   CO2

b.  KHCO3 + 2HCl          →    KCl +      H2O    +    CO2

## Calculation Involving Titration

PERCENTAGE PURITY AND IMPURITY

During the titration process of an impure acid or base is titrated only the pure part of either acid or base react with the base or acid.  Therefore, the percentage (%) purity or impurity can be calculated.

Practical Chemistry by Makanjuola pages 1-15.

New School Chemistry by Osei Yaw Ababio pages 165 – 183

Practical Chemistry for Schools and Colleges pages 100 – 170

GENERAL EVALUATION

1. What is volumetric analysis
2. Name five  apparatus used in volumeric analysis.
3. Define the following terms;   a. Indicator  b. Buffers  c. pH scale

WEEKEND ASSIGNMENT

1. C + water give colourless solution (a) c is a soluble salt (b) c is partially dissolve in water (c) c is a filterate (d) c is a residue
2. ____ is the apparatus use to convert vapor into liquid during distillation. (a) conical flask (b) distillation column   (c) lie-big condenser (d) round bottom flask
3. X which fumes in most air can be suitably stored (a) under paraffin or naphtha (b) In a white bottle (c) inside a corked conical flask (d) inside a burette.
4. The observation in bubbling SO2 into acidified KMnO4 solution is (a) The solution turns to green   (b) the solution becomes decolourized  (c) no visible reaction (d) the solution turns steam
5. The two substances that can give both H2 and ZnSO4 when added to H2SO4 are: (a) Magnesium and Zinc (b) Magnesium and CuO (c) Sodium and NaOH (d) iron and copper

THEORY

1. State what would observe on
2. mixing Zinc dust with CuSO4 solution
3. adding concentrated HNO3 to freshly prepared FeSO4 solution
4. A salt sample was suspected to be either Na2CO3 or NaHCO3. A student who was required to identify it, tested a portion for solubility in water and for effects on litmus paper.
5. What was the observation in each case?
6. State the reason why the student’s procedure was unsuitable.
7. Describe briefly how you would have identified the salt.