A student mixed some soil with water in a beaker and allowed it to settle. He filtered the contents of the beaker and obtained a clear filtrate. When he put a few drops of the filtrate on the pH paper, the pH paper turned yellowish orange. Which of the following should the student put on this pH paper so that it may change its colour to greenish-blue?
(1) NaHCO3 solution
(2) HCI solution (3) Vinegar solution (4) Common salt solution
Answers
Answered by
1
Answer:
HCl is the correct answer
Answered by
1
NaHCO3 (sodium bicarbonate) solution should be added to the pH paper so that its colour changes to greenish-blue.
Explanation:
- The Yellowish orange colour of the pH paper shows that it is an acidic substance. To change the colour from yellowish orange to greenish-blue, antacid should be added. It is to be noted that antacids have a basic nature.
- Lemon juice is citric acid. Vinegar is acetic acid. Common salt is neutral in nature. Only sodium bicarbonate can act as an antacid and help in turning the acidic paper into greenish-blue.
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