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You have two test tubes 'A' and 'B'. Test tube 'A' contains paste of turmeric whereas test tube 'B' contains aqueous solution of phenolphthalein. On adding a few drops of dilute hydrochloric acid to these test tubes the contents of:

You have two test tubes 'A' and 'B'. Test tube 'A' contains paste of turmeric whereas test tube 'B' contains aqueous solution of phenolphthalein. On adding a few drops of dilute hydrochloric acid to these test tubes the contents of: Correct Answer 'A' would remain yellow while those of 'B' would remain colourless.

  • Acid: The substances that taste sour contains acids. The chemical nature of such substances is acidic. Ex- lemon, curd, HCl, H2SO4 etc.
  • Base: The substances which are bitter in taste and feel soapy on touching are known as bases. The nature of such substances is said to be basic. Ex- Soap, NaOH, lime water (Ca(OH)2) etc.

Since, we cannot taste every substance to know its chemical nature so,

A special type of substances is used to test whether a substance is acidic or basic. These substances are known as indicators. 

Indicators: The indicators change their colour when added to a solution containing an acidic or a basic substance.

Some natural indicators are -

Indicator Acid Solution Basic Solution Neutral Solution
Blue Litmus Solution Red No colour change No colour change
Red Litmus Solution No colour change Blue No colour change
Methyl Orange Red Yellow Orange
Phenolphthalein Colourless Red Colourless

 

Household Indicators-

Indicator Acid Solution Basic Solution Neutral Solution
Turmeric Juice (Yellow) Yellow Deep Brown Yellow
Red Cabbage Juice (Purple) Red Green Purple

 

  • According to the question, if we add dill HCl (acidic) in Turmeric juice. It will remain yellow.
  • And in Phenolphathalein It will be colourless.

Hence, it becomes clear that 'A' would remain yellow while those of 'B' would remain colourless.

Related Questions

Samples A, B, C and D are tested for their nature using turmeric and Phenolphthalein and the following observations are recorded. A- turns reddish-brown on adding turmeric B- turns pink on adding Phenolphthalein C- turns yellow on adding turmeric D- remains colourless on adding Phenolphthalein What can be concluded about the nature of A, B, C and D?
Reaction between which of the following will NOT lead to the evolution of Hydrogen gas? (A) Magnesium with dilute hydrochloric acid (B) Copper with dilute hydrochloric acid (C) Sulphur powder with dilute hydrochloric acid (D) Aluminium with dilute hydrochloric acid
Solution-1 containing 10% hydrochloric acid and 20% acetic acid at the rate F combines with Solution-2 containing 20% hydrochloric acid and 30% acetic acid at the rate D, the product formed contains 20% hydrochloric acid and 30% acetic acid at the rate P, how many independent equations containing F, D, and P are possible?
A boy has a thick paste of turmeric. On adding this paste to hydrochloric acid and aqueous solution of sodium hydroxide separately, what colour(s) would he observe?
Suppose you have four test tubes labelled as 'A', 'B', 'C' and 'D', 'A' contains plain water, 'B' contains the solution of alkali, 'C' contains the solution of an acid, and 'D' contains the solution of sodium chloride. Which one of these solutions will turn phenolphthalein solution pink?
Ayesha put two drops of oil on the lid of her tiffin box. Next to that, she put two drops of water and two drops of sugar solution. She tilted the lid. She saw some drops slid down quickly, while some were left behind. Which drops slid down her tiffin box the fastest?
Which of the following solutions will conduct electricity? (i) Aqueous solution of glucose (ii) Aqueous solution of acetone (iii) Aqueous solution of acetic acid (iv) Aqueous solution of milk of magnesia
Suppose you have four test tubes labelled as 'A', 'B', 'C' and 'D'. 'A' contains plain water, 'B' contains solution of an alkali, 'C' contains solution of an acid, and 'D' contains solution of sodium chloride. Which one of these solution will turn phenophthalein solution pink?
Which of the following statements about acids are correct? (i) All compounds containing hydrogen are acidic. (ii) Acids generate H+ ions in aqueous solution. (iii) Aqueous solution of acids change the colour of turmeric into red. (iv) Aqueous solution of acids conduct electricity.
A student puts a punch of turmeric in solutions marked A and B. She writes the following statements in her copy S1 - Solution A turns red and there is no change in solution B S2 - Solution A is base and solution B is an acid. S3 - turmeric can be used to differentiate between acids, bases and salts.  Which of the following statements is correct?