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How is the presence of an acid tested with a strip of red litmus paper?
No colour change on red litmus paper with acids as acid turns blue litmus to red, so red litmus is first to be changed to blue litmus. In order to do so,
- Dip the red litmus paper into an alkaline solution. It will turn blue.
- Then dip this blue litmus paper into the acid, it will turn red again, thus indicating the presence of an acid.
- Related Articles
- A student placed a pinch of solid sodium hydrogencarbonate on a strip of red litmus paper. He found that the colour of red litmus paper strip :
- Hold one moist and one dry strip of blue litmus paper over dry HCl acid gas. Which strip will turn red and why?
- 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.
- A colourless liquid sample was tested with pH paper strip. The colour of the strip changed to reddish pink. The sample could be :
- What do you mean by Blue litmus paper and Red litmus paper?
- A student placed a few drops of a liquid over a portion of the red litmus paper as shown here. He observed that the red litmus paper turned blue. The liquid could be :(1) dilute hydrochloric acid (2) dilute sodium hydroxide(3)water(4)dilute acetic acid"
- How the presence of Carbohydrates can be tested in a sample solution?
- 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.
- When the strip of pH paper was put in a given solution, the pH paper changed to orange red. The given solution is most likely to be of :(1)sodium hydroxide(2) hydrochloric acid(3)sodium bicarbonate(4)ethanoic acid
- True or False:Nitric acid turns red litmus blue
- A student prepared hydrogen chloride gas by treating sodium chloride with concentrated sulphuric acid in a test-tube. He held a strip of dry blue litmus paper in HCl gas coming out of the test-tube. The student observed that on coming in contact with HCl gas, the colour of blue litmus paper :
- Which of the following will be required to identify the gas evolved when dilute hydrochloric acid reacts with zinc metal?(a) Red litmus paper(b) pH paper(c) Lime water(d) A burning splinter
- A drop of colourless liquid was placed on blue litmus paper. The litmus paper turned red. The liquid could be :(1)dilute hydrochloric acid(2)dilute sodium hydroxide solution(3) distilled water(4)sodium bicarbonate solution
- Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip:
- Here are some results of solutions tested with universal indicator paper:
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