$5$ mL of lemon juice was taken in a test tube. Its pH was determined by using a pH paper. Excess of sodium hydroxide solution was then added to the lemon juice in the test tube and the pH of the resulting solution was again determined. What would be the change of colour?

Open in App

Solution

When $p H$ of lemon juice acidic in nature was determined using $p H$ paper.
color change:- Blue to vivid red
When excess $N a O H$ added to lemon juice $p H$ changed; acidity decreased $⟶ N a O H$ in excess, $∴$ becomes basic.
Pink $⟶$ Blue

Suggest Corrections

Similar questions

Q. Three students were given colourless liquids of water, lemon juice and mixture of water and lemon juice After testing these liquids with pH paper a sequence in colour change of pH paper was reported Which is the correct sequence?

Q. A student was given two test-tubes A and B each containing a colourless solution. When a few drops of universal indicator were added to the two test-tubes, one by one, then the colour of solution in test-tube A changed to blue whereas the colour of solution in test-tube B changed to orange.
(a) Which test-tube has a solution of pH higher than 7?
(b) Which test-tube has a solution of pH lower than 7?
(c) Which test-tube has an acidic solution?
(d) Which test-tube has an alkaline solution?

Four student (a), (b), (c) and (d) measured the pH values of water, lemon juice and sodium bicarbonate solution. What is the correct decreasing order of pH values?

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

Q. The test-tube I contains sodium bicarbonate soultion whereas test-tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns :
(1) red in I and blue in II
(2) blue in both
(3) blue in I and red in II
(4) red in I and pink in II

Join BYJU'S Learning Program

5mL of lemon juice was taken in a test tube. Its pH was determined by using a pH paper. Excess of sodium hydroxide solution was then added to the lemon juice in the test tube and the pH of the resulting solution was again determined. What would be the change of colour?

When pH of lemon juice acidic in nature was determined using pH paper.color change:- Blue to vivid redWhen excess NaOH added to lemon juice pH changed; acidity decreased⟶NaOH in excess, ∴ becomes basic.Pink⟶Blue

$5$ mL of lemon juice was taken in a test tube. Its pH was determined by using a pH paper. Excess of sodium hydroxide solution was then added to the lemon juice in the test tube and the pH of the resulting solution was again determined. What would be the change of colour?

When $p H$ of lemon juice acidic in nature was determined using $p H$ paper.
color change:- Blue to vivid red
When excess $N a O H$ added to lemon juice $p H$ changed; acidity decreased $⟶ N a O H$ in excess, $∴$ becomes basic.
Pink $⟶$ Blue