Title Volumetric analysis iswori.com.np .pdf ✅

Volumetric analysis Volumetric analysis is defined as the process of the determination of concentration of unknown solution by finding its volume which will exactly react with a definite volume of another solution of known concentration. Gravimetric analysis is defined as the process of quantitative determination of an analyte(the ion being analyzed) based on mass of solid. At first solution of given sample is prepared, treated with suitable reagent to convert into insoluble form which is made pure by washing, dried and weighed. Then the weight of the required substance is calculated with the help of theoretical concept. 1
Eg. How much SO4 -- ion is present in given sample of Na2SO4 ? A known amount of given sample is dissolved in water and excess amount of BaCl2 is added to the solution so that all SO4 -- is converted into insoluble BaSO4. The precipitate is washed and made pure, it is then dried and weighed. Let the weight of BaSO4 formed is Y gm. We know, 233 gm. of BaSO4 contains 96 gm. of SO4 – - ions. So, Y gm. of BaSO4 contains (96/233) x Y gm. of SO4 – - ions. 2
Pre-requirements in volumetric analysis Equivalent weight (equivalent mass) It is defined as “the no. of parts by wt. of the substance that combines with or displaces 1.008 parts by wt. of hydrogen, 8 parts by wt. of oxygen or 35.5 parts by wt. of chlorine.” Equivalent weight is unit less. Equivalent weight expressed in gm. is called gm. equivalent. No. of gm. eqvt. = given wt./eq.wt. 3