lto-CHEM 112-Spring18-ZHONG Activities and Due Dates HW 14 (13 pt.) 3/18/2018 06

Question

lto-CHEM 112-Spring18-ZHONG Activities and Due Dates HW 14 (13 pt.) 3/18/2018 06:00 PM 443.2/1003/14/2018 10:32 PM -Print Calculator -d Periodic Table uestion 38 of 38 Sapling Learning A certain indicator, HA, has a Ka value of 0.00025. The protonated form of the indicato is yellow and the ionized form is blue. What is the pKg of the indicator? Number PK. What is the color of this indicator in a solution with pH 6? O green O blue O yellow O Previous Gve Up & View Souton e Check Answer Exi Next Hint 18

Explanation / Answer

We know that pKa = -logKa

pKa= -log(0.00025)= - (-3.60) = 3.60

Since pH =6, acidic in nature. In ionized form it has H+ ions in solution. Hence acts as acid. So color is blue similar to ionized form.

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