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
What do we observe on pouring acetic acid on red and blue litmus papers?
(A) Red litmus remains red and blue litmus turns red.
(B) Red litmus turns blue and blue litmus remains blue.
(C) Red litmus turns blue and blue litmus turns red.
(D) Red litmus becomes colourless and blue litmus remains blue.
Why should curd and sour substances not be kept in brass and copper vessels?
Write a word equation and then a balanced equation for the reaction taking place when:
Dilute sulphuric acid reacts with zinc granules.
Complete and balance the following chemical equation:
\[\ce{CuO_{(s)} + HCl_{(aq)} ->}\]
What ions are present in the solution of the following substance? (write the symbols only)
Nitric acid
Write the chemical formula of washing soda. How can it be obtained from baking soda? List two industries in which washing soda is used for other purposes than washing clothes.
Magnesium hydroxides are used for treating _______
The table given below shows the reaction of a few elements with acids and bases to evolve Hydrogen gas.
| Element | Acid | Base |
| A |
✗
|
✗ |
| B |
✓
|
✓ |
| C | ✓ | ✗ |
| D | ✓ | ✓ |
Which of these elements form amphoteric oxides?
A student added 10 g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition take place?
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
Which of the following is used for dissolution of gold?
Which of the following statements is true for acids?
A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance which can be moulded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid mass and cannot be used for moulding purposes. Identify the sulphate salt. Why does it show such a behaviour? Give the reaction involved.
Acids present in fruits and vegetables are called ______ acids.
Are all acids corrosive in nature? Name a few acids which are non-corrosive and may be part of our food.
Copper or brass cooking vessels are coated with tin metal. Why?
The formula of bleaching powder is ______.
Consider the following salt:
YCl
What would be the pH of the solution if, in YCl, Y is sodium? Give a reason for your answer.
Consider the following salt:
NH4X
If in salt NH4X, X is nitrate, then its solution will give what colour with a universal indicator? Why?
