a) define a universal indicator. write its one use.
b) solution A gives pink colour when a drop of phenolphthalein indicator is added to it. solution B gives red colour. when a drop of methyl orange is added to it. what type of solution are A and B and which one of the solution A and B will have a higher pH value.
c) name one salt whose solution has pH more than 7 and one salt whose solution has pH less than 7.
Answers
The acids and bases are chemical substances which can be identified in the solution using universal indicator, pH paper and chemical reagents.
Explanation:
(a) The universal indicator is used to identify whether the provided solution is acid or base. The universal indicator changes its color in the presence of acid or base. This also indicates the strength of the solution.
(b) The solution A gives pink color when treated with phenolphthalein indicator is added to it. This indicates that the solution is basic. It will have a pH range of 9-10. The solution B is giving red color as when the drop of methyl orange is added to it. Hence, the solution is acidic in nature. It will have a pH range of between 4-6. On comparing the pH range of both the solutions this can be said that solution A has higher pH value.
(c) The sodium carbonate solution has a pH range of more than 7 and ammonium chloride has a pH range below 7.
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