Gravimetric Analysis Chemistry Formulas

Gravimetric Analysis

Gravimetric Analysis is a quantitative chemical analysis method. In gravimetric analysis, we establish relationship between weights of two substances or sometimes establish relationship between weight of a substance with volume of gas or gases.
Gravimetric Analysis - Gravimetric Titration

How to Solve Problems of Gravimetric Analysis for Mass to Mass Relationship

Solve problems of gravimetric analysis for mass to mass relationship as per following instructions,
1. First of all note down the balanced equation that represent the chemical change occur.
2. Then, write the number of moles of the reactants and products below the above balanced equation, then by using respective molecular formula write the relative weights of the substances on reactant side and product side.
3. Then, by using unitary method, calculate the unknown factor.
Now you have Question what is Unitary Method?
Unitary method is math’s technique to get the solution of problem by finding the value of single unit.

How to Solve Problems of Gravimetric Analysis for Mass to Volume Relationship

Solve problems of gravimetric analysis for mass to volume relationship as per following instructions,
1. First of all note down the balanced equation that represent the chemical change occur.
2. Then, write the weights of solid substances on reactant side and product side.
3. Gases are generally not measured in mass so they are measured in volumes. So before getting weight of gas, first check that volume of gas is given at NTP (Normal Temperature and Pressure), STP (Standard Temperature and Pressure) or at other temperature and pressure.
4. With the help of ideal gas equation (PV=nRT), we can convert the volume of any gas at any temperature and pressure into its weight and vice-versa.
Ideal Gas Equation,
           PV = nRT
Also,    PV = g/M)×RT     
As mole = weight in gram/ molecular weight.
Where, P is Pressure, V is Volume, n is no. of moles, R is gas constant, T is Temperature, g is Weight in gram, M is Molecular weight.
5. Then, by using unitary method, calculate the unknown factor.

How to Solve Problems of Gravimetric Analysis for Volume to Volume Relationship

Solve problems of gravimetric analysis for volume to volume relationship as per following instructions,
1.    First of all note down the balanced equation that represent the chemical change occurs.
2.    Then, write the volume of the reactants and products below the above balanced equation, or remember “one mole of any gas occupies 22.4 liters at NTP” then by using this write volume of the gas on reactant side and product side.
Remember,
                STP means “Standard Temperature and Pressure”.
                At STP,
       Pressure = 1 bar = 0.987 atm
mm Temperature = 273 K or 0°C
NTP means “Normal Temperature and Pressure”.
At NTP,
Pressure = 1 atm
Temperature = 293 K or 20°C
3.    We can get volume of gas at NTP with the help of ideal gas equation, if volume of gas is given at other temperature or pressure.
Remember,
        Avogadro’s Law:
                            According to Avogadro’s law “Equal volume of all the gases under same condition of pressure and Temperature contain equal no. of molecules.”
4.    Then, by using unitary method, calculate the unknown factor.

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