Back titration
Synopsis
The objective of this experiment is to determine the percentage by mass of calcium carbonate,CaCO3 in toothpaste using back titration technique. A known weight portion of toothpaste is obtained to react with known volume and concentration of standard acid solution. After completing the reaction, the resulting solution containing excess acid is back titrated with known volume and concentration of standard base solution. Determination of excess acid after reaction allow us to calculate the amount of acid react with CaCO3 in toothpaste sample. My result for this experiment shows that 19.6% of calcium carbonate presents in toothpaste sample. In conclusion,CaCO3 only made up approximately one fifth of toothpaste sample, toothpaste derived from a variety of component such as fluoride, water and detergent. Since the result obtained approaching 20%, saying that most of the error is avoided, the chemical reaction in this experiment is rapid and complete with no side reaction, determination of concentration of reactant is accurate, it is a successful experiment. Introduction
The purpose of this experiment is to improve the understanding of practical application of back titration. Back titration is designed to resolve the problems encountered with forward titration. Back titration can be used for many reasons: when the analyte is volatile or insoluble in water; when the analyte contains impurities that interfere with forward titration; when the end point is difficult to identify in forward titration; when the analyte react slowly with titrant in forward titration.In this experiment, a weighted portion of toothpaste is analysed to determine the percentage by mass of CaCO3 present in the toothpaste sample. Back titration technique is applied in this experiment instead of forward titration.This is because the substance being analysed, toothpaste is insoluble in water but soluble in acid. Theory
Titration is the scientific techinique of volumetric analysis
The objective of this experiment is to determine the percentage by mass of calcium carbonate,CaCO3 in toothpaste using back titration technique. A known weight portion of toothpaste is obtained to react with known volume and concentration of standard acid solution. After completing the reaction, the resulting solution containing excess acid is back titrated with known volume and concentration of standard base solution. Determination of excess acid after reaction allow us to calculate the amount of acid react with CaCO3 in toothpaste sample. My result for this experiment shows that 19.6% of calcium carbonate presents in toothpaste sample. In conclusion,CaCO3 only made up approximately one fifth of toothpaste sample, toothpaste derived from a variety of component such as fluoride, water and detergent. Since the result obtained approaching 20%, saying that most of the error is avoided, the chemical reaction in this experiment is rapid and complete with no side reaction, determination of concentration of reactant is accurate, it is a successful experiment. Introduction
The purpose of this experiment is to improve the understanding of practical application of back titration. Back titration is designed to resolve the problems encountered with forward titration. Back titration can be used for many reasons: when the analyte is volatile or insoluble in water; when the analyte contains impurities that interfere with forward titration; when the end point is difficult to identify in forward titration; when the analyte react slowly with titrant in forward titration.In this experiment, a weighted portion of toothpaste is analysed to determine the percentage by mass of CaCO3 present in the toothpaste sample. Back titration technique is applied in this experiment instead of forward titration.This is because the substance being analysed, toothpaste is insoluble in water but soluble in acid. Theory
Titration is the scientific techinique of volumetric analysis