Table of Contents
- 1 Why H2SO4 require about twice the volume of NaOH solution for the titration?
- 2 What happens when H2SO4 is added to NaOH?
- 3 Why must the titration be repeated three times?
- 4 What is the balanced equation of NaOH and H2SO4?
- 5 What will happen if NaOH is used in place of dilute Sulphuric acid and the test tube is heated?
Why H2SO4 require about twice the volume of NaOH solution for the titration?
The volume of H2SO4 required is smaller than the volume of NaOH because of the two hydrogen ions contributed by each molecule.
Why did the sulfuric acid need more sodium hydroxide to turn the phenolphthalein pink than the nitric acid?
Because sulfuric acid is a strong acid and sodium hydroxide is a strong base, the phenolphthalein will turn pink because the solution has become more basic. The pH will become more neutral, but will be dependent on the concentration of each substance.
What happens when H2SO4 is added to NaOH?
When sodium hydroxide react with sulphuric acid they form Sodium sulphate and water. The reactants is base and an acid, which leads to neutralization process and yields a salt .
Why do we add H2SO4 twice?
To prevent the hydrolysis, Conc. H2SO4 needs to be added to the Mohr’s salt crystals during the preparation of its standard solution. Another reason is also to prevent the oxidation of Fe2+ ions of Mohr’s salt to Fe3+ ions.
Why must the titration be repeated three times?
Since you know how much standard you have used and its concentration you can work out the concentration of the unknown sample. Remember you should always repeat whole process at least 3 times to ensure you have an accurate result, as there is the potential for both random and systematic errors to affect your results.
Why is standardization of NaOH necessary?
The reason we must standardize strong base solutions is because substances like NaOH will naturally absorb moisture from the air and react with gases in the air, such as CO2, to produce unwanted impurities in the stock sample of the base.
What is the balanced equation of NaOH and H2SO4?
Na2SO4 + H2O
NaOH + H2SO4→ Na2SO4 + H2O .
What is one product if solutions of H2SO4 and NaOH are mixed?
2. A reaction between sulfuric acid and sodium hydroxide is of an acid-base type, or is also known as a neutralization reaction. In this process, both compounds undergo a reaction to neutralize the acid and base properties. The products of this process are salt and water.
What will happen if NaOH is used in place of dilute Sulphuric acid and the test tube is heated?
(d) If sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated, sodium zincate is formed along with hydrogen gas. But heating of test tube will increase the rate of formation of hydrogen gas as heating of reaction mixture increases the rate of reaction.
Why we add H2SO4 in titration?
Sulphuric Acid (H2SO4) is used in the redox titration process because it provides the H(+) ions necessary for the reaction to occur more quickly whilst the sulphate(-) ions barely react during the reaction. Therefore, sulfuric acid is added to make the solution acidic.