Question

plx plz explanation... plz explanation

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Answer 1

ANSWER----

■ Gold ---

• It the minimum amount of starch in milligrams which prevents a colour change from red to violet of 10ml gold sol by the addition of 1 ml of 10% NaCl solution.

Answer--- Gold number = 250

● Explanation -->

○ Given --

▪ 0.25 g = 250 mg of starch is added to 10 ml gold solution.

○ Solution --

■ For 10 ml gold solution, colloid required is calculated by

--> x = 250 × 10 / 10

--> x = 250 mg.

▪ Therefore, gold number of given starch will be 250.