What will be the effect on the colour of blue litmus paper when it is dropped in each of the following solution. 1. Water 2. Lime juice 3. Dilute hydrochloric acid 4. Sodium hydroxide solution.
first, decide which are acids, and which are bases.
Then, what does the litmus paper do in each case?
What will be the effect on the colour of blue litmus paper when it is dropped in sodium hydrogen solution
To determine the effect on the color of blue litmus paper when dropped in each of the mentioned solutions, you need to understand the concept of litmus paper and how it works.
Litmus paper is a pH indicator that changes color in the presence of acidic or basic solutions. It is made from a natural dye called litmus, which is extracted from lichens. Litmus paper comes in two forms: blue litmus paper and red litmus paper.
Blue litmus paper is blue in color at a neutral or basic pH, but it turns red in the presence of an acidic solution. So, the color change of blue litmus paper will depend on the pH of the solutions you mentioned.
Now, let's examine the effect on the color of blue litmus paper when it is dropped in each of the mentioned solutions:
1. Water: Water is neutral, meaning it has a pH of 7. Since blue litmus paper remains blue in the presence of neutral solutions, it should not change color when dropped in water. Therefore, the blue litmus paper will stay blue.
2. Lime juice: Lime juice is acidic due to the presence of citric acid. Citric acid is a weak acid, so it will turn blue litmus paper red. Therefore, the blue litmus paper will turn red when dropped in lime juice.
3. Dilute hydrochloric acid: Hydrochloric acid (HCl) is a strong acid. It will release hydrogen ions (H+) in water, making the solution highly acidic. Blue litmus paper will turn red in the presence of an acidic solution, so it will also turn red when dropped in dilute hydrochloric acid.
4. Sodium hydroxide solution: Sodium hydroxide (NaOH) is a strong base. It will release hydroxide ions (OH-) in water, making the solution highly alkaline or basic. Blue litmus paper will stay blue in the presence of basic solutions, so it will remain blue when dropped in sodium hydroxide solution.
In summary:
- Blue litmus paper will stay blue in water, as water is neutral.
- Blue litmus paper will turn red in lime juice, dilute hydrochloric acid, and sodium hydroxide solution, as they are acidic, acidic, and basic, respectively.