Advertisements
Advertisements
Question
Answer the following question:
What is the universal indicator? Does Mg (OH)2 react with sodium hydroxide? If not, why?
Advertisements
Solution
- Universal indicator is an indicator which is a mixture of several indicators.
- It has a very wide range and can indicate pH value almost from 0 to 14.
- When one or two drops of the universal indicator are added to a solution, it changes its colour. This colour is matched against the colour on a standard colour chart (usually given on its bottle) to find the pH, and the pH value can be read. This indicates the strength of the solution too.
- Universal indicator is available as a solution or in the form of paper strips.
- Mg(OH)2 does not react with sodium hydroxide as both are bases.
APPEARS IN
RELATED QUESTIONS
Why should curd and sour substances not be kept in brass and copper vessels?
Fill in the blank in the following sentences:
Substances do not show their acidic properties without.......................... .
What happens when an acid reacts with a metal?
What happens when an acid reacts with a base?
On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
Predict the new compound formed which imparts a blue-green colour to solution.
What ions are present in the solutions of following substances? (write the symbols only)
Hydrochloric acid
What is the chemical formula of washing soda?
What is the chemical formula of bleaching powder?
Explain the following:
Lead carbonate does not react with dilute HCl.
Answer the following question.
Identify the acid and base which form sodium hydrogen carbonate. Write the chemical equation in support of your answer. State whether this compound is acidic, basic, or neutral. Also, write its pH value.
Acids turn blue litmus paper to ______.
Common salt besides being used in kitchen can also be used as the raw material for making
- washing soda
- bleaching powder
- baking soda
- slaked lime
What are strong and weak acids? In the following list of acids, separate strong acids from weak acids.
Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid.
In the following schematic diagram for the preparation of hydrogen gas as shown in the figure, what would happen if following changes are made?
- In place of zinc granules, same amount of zinc dust is taken in the test tube
- Instead of dilute sulphuric acid, dilute hydrochloric acid is taken
- In place of zinc, copper turnings are taken
- Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.
Acids present in fruits and vegetables are called ______ acids.
Vinegar is ______ in taste.
______ change the colour of the indicators.
What is the correct procedure for mixing acid and water? Why?
What property do acids and bases have in common? Explain it with an example.
Some metals react with acids to produce salt and hydrogen gas. Illustrate it with an example. How will you test the presence of this gas?
