Why do titration 3 times

Adding more of the base needed to reach the equivalence would mean you have higher volume which will make the calculated concentration of NaOH lesser. It does not affect the titration reading as water does not react with the reagents or change the number of moles of acid added.

An acid -alkali titration can be used to find out what volume of acid or alkali of known concentration exactly neutralises a known volume of alkali or acid of unknown concentration. This concentration can then be calculated. To obtain valid results, it is important that measurements are precise and accurate. Titrations are carried out quickly the first time to get a rough idea of the approximate volume that is needed to reach the end point. This value is too big since it is unlikely to have been stopped exactly at the endpoint.

Many real life uses of titration are used each day, especially in the medical world and labs. Pharmacists use it to get the proper mix when compounding medicines. Titration is used to measure blood sugar levels and to analyze blood for other diagnoses. Titration is a technique to determine the concentration of an unknown solution. Typically, the titrant the solution of known concentration is added through a burette to a known volume of the analyte the solution of unknown concentration until the reaction is complete.

You forgot to add the phenolphthalein indicator. N Phenolphthalein is an indicator. It will not affect actual molarity of NaOH. The experimenter will not have been able to see a color change, so they would have to start over again. The common application of indicators is the detection of end points of titrations. The colour of an indicator alters when the acidity or the oxidizing strength of the solution, or the concentration of a certain chemical species, reaches a critical range of values.

Suppose that a titration is performed and The above equation can be used to solve for the molarity of the acid. A strong acid- strong base titration is performed using a phenolphthalein indicator.

Phenolphtalein is chosen because it changes color in a pH range between 8. It will appear pink in basic solutions and clear in acidic solutions.

Neutralization is the basis of titration. Phenolphthalein indicator distinguishes the pH change between pH 8 to Therefore it is used for strong acid and strong base titrations or weak acid and strong base titrations. As the titration takes place, there is a slow change in the pH in the initial stage while approaching the equivalence point, there is a very rapid change in the pH of the solution…. Viva Voice:. There is very little change in pH when the base is initially added.

Below the equivalence point, the pH is a function of the amount of excess acid present. The pH increases slowly at first because the pH scale is logarithmic, which means that a pH of 1 will have 10 times the hydronium ion concentration than a pH of 2.

The pH changes quite slowly at the start of the titration, and almost all the increase in pH takes place in the immediate vicinity of the endpoint. The titration of either a strong acid with a strong base or a strong base with a strong acid produces an S-shaped curve.