A student prepared solutions of
(i) an acid and
(ii) a base in two separate beakers.
She forgot to label the solutions, and litmus paper is not available in the laboratory. Since both the solutions are colourless, how will she distinguish between the two?
Phenolphthalein can be used to check the beakers that contain acid and which one contains a base as it turns colourless in acidic solutions and pink in basic solutions.
Natural indicators; like China rose or turmeric can also be used.
Turmeric is a natural indicator. Turmeric is of yellow colour. Turmeric paper turns red when it is dipped into a basic solution. Turmeric paper does not change its colour with acid.
China rose is also a natural indicator that can be used. China rose solution gives dark pink (magenta) colour with acid and green colour with base.
Related Articles
- Two solutions X and Y were found to have pH value of 4 and 10 respectively. The inference that can be drawn is(a) X is a base and Y is an acid(b) Both X and Y are acidic solutions(c) X is an acid and Yis a base(d) Both X and Y are bases
- In an experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in four beakers containing solutions A, B, C and D. The colour of universal indicator paper in these solutions is as shown below :The solution having lowest pH value is:(1) A(2) B(3) C(4)D"
- Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?
- Which one of the following options is true, and why? \( y=3 x+5 \) has(i) a unique solution,(ii) only two solutions,(iii) infinitely many solutions.
- Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. Iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below.
- What is the difference between solutions and colloids?
- Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. A few pieces of iron filings were then added to both solutions. The four students A, B, C and D recorded their observations in the form of a table as given below:Which student has recorded the correct observation?DCBA
- Two solutions A and B have pH values of 3.0 and 9.5 respectively. Which of these will turn litmus solution from blue to red and which will turn phenolphthalein from colourless to pink?
- A student puts a drop of reaction mixture of a saponification reaction first a blue litmus paper and then on a red litmus paper. He may observe that:There is no change in the blue litmus paper and the red litmus paper turns white.There is no change in the red litmus paper and the blue litmus paper turns red.There is no change in the blue litmus paper and the red litmus paper turns blue.No change in colour is observed in both the litmus papers.
- Consider the following salts :Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH4)2SO4 Which of these salts will give : (a) acidic solutions? (b) neutral solutions? (c) basic solutions (or alkaline solutions)?
- A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
- What are the different types of Solutions?
- During an experiment, the students were asked to prepare a 10% (Mass/Mass) solution of sugar in water. Ramesh dissolved 10g of sugar in 100g of water while Sarika prepared it by dissolving 10g of sugar in water to make 100g of the solution.(a) Are the two solutions are of the same concentration?(b) Compare the mass% of the two solutions.
- Look at figure which shows solutions taken in test tubes A, B, C and D. What colour is expected when a piece of red litmus paper is dropped in each test tube? Nature of the solutions is given in the table for your help
- A student measured the pH values of four solutions A, B, C and D which were found to be 4, 1, 13 and 11 respectively. Which of the following statements are correct about these solutions?(a) A is strong acid and B is weak acid (b) B is strong acid and D is weak base (c) D is strong base and C is weak base (d) C is strong base and A is weak acid (1) (a) and (b) (2) (b) and (c) (3) (c) and (d) (4) (b) and (d)
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies