A weak acid indicator HIn is blue while its conjugate base In- is green. Ka,In for...

Question

Question

A weak acid indicator HIn is blue while its conjugate base In- is green. Ka,In for the indicator is 8.3 x 10-5

Over what pH range does the indicator change color?

lower pH?

upper pH?

science chemistry

Answer 1

Answer #1

Given, K_a of the indicator = 8.3 × 10^-5

So, pK_a = -log₁₀(8.3 × 10^-5) = 4.08

Therefore, the indicator changes color in the pH range of 3.08 to 5.08.

Answer 2

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