Why HCl is titrated with NaOH?
Why HCl is titrated with NaOH?
Purpose: To determine the concentration of an unknown solution of HCl by titrating with a 0.1 mol/L solution of NaOH. To plot a graph of pH as a function of the volume of NaOH added and generate a titration curve.
Which indicator is used for titration of NaOH and HCl?
In the titration of NaOH and HCl, which of the following indicator will be used? Solution : In the titration of strong base with strong acid, we can use methyl orange, methyl red, phenolphthalein as indicator.
How do you do NaOH titration?
(b) Titration of Sodium Hydroxide and Oxalic Acid Solution Pipette out 20ml of NaOH solution is a conical flask. Add 2-3 drops of phenolphthalein indicator to it. Titrate the base with oxalic acid solution until pink colour disappears. Repeat the titration till three concordant readings are obtained.
What are indicators in titration?
Indicator: A substance that changes color in response to a chemical change. An acid–base indicator (e.g., phenolphthalein) changes color depending on the pH. Redox indicators are also used. A drop of indicator solution is added to the titration at the beginning; the endpoint has been reached when the color changes.
What is the reaction between HCl and NaOH?
Explanation: The reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is a neutralization reaction which results in the formation of a salt, sodium chloride (NaCl) , and water (H2O) .
What is the pH of HCl and NaOH?
7
At the end point of the tirtation what is the pH? At the endpoint the moles of HCl = the moles of NaOH so all that is present is H2O, Cl–, and Na+. So, the pH is 7.
Why does the colour change in titration?
As the EDTA solution is added, the concentration of the metal ion in the solution decreases due to the formation of metal-EDTA complex. At the end point no more free metal ions are present in the solution. At this stage, the free indicator is liberated and hence the colour changes from red to blue.
What is the range of pH scale?
0 – 14
The range goes from 0 – 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
What is the pH of the solution at the endpoint of the titration?
After the end point of the titration, the pH is determined by the concentration of the base. At the end point of the tirtation what is the pH? At the endpoint the moles of HCl = the moles of NaOH so all that is present is H2O, Cl–, and Na+. So, the pH is 7.
What is the principle of acid base titration?
Principle of Acid-Base Titration The strength of an acid solution is determined by titrating it against a standard base solution or determining the strength of an alkali solution by titration with a standard acid solution referred to as Acid-Base Titration.
Why is EDTA used in titration?
The most common indicators in complexometric titrations are organic dyes which function by forming a colored complex with the metal ion being titrated. During the reaction, EDTA replaces the indicator to form a more stable complex with metal and when the reaction is completed the change for the color is observed.
What has a pH of zero?
A solution of a strong acid, such as hydrochloric acid, at concentration 1 mol dm−3 has a pH of 0.