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1) Phenol red is an indicator that changes color over a range from pH=6.4 to pH=8.0. What is Ka...

Question:

1) Phenol red is an indicator that changes color over a range from pH=6.4 to pH=8.0. What is Ka of phenol red? Express to 1 sig fig

(I put 0.2 but it's wrong)

2) Alizarin yellow R, Ka=7.9x10^-12, is yellow in its protonated form (HX) and red in its ionized form (X-). At what pH will alizarin yellow R be a perfect orange color?

Express to 1 dec place

Acids and bases

An acid is a substance that breaks down in the water to release hydrogen ions. A base is a substance that breaks down in the water to release hydroxide ions. Acids and bases react in neutralization reaction to form water and salt.

Answer and Explanation: 1

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{eq}p^H = pK_a + log \frac {[X-]}{[HX]} {/eq}

X- = deprotonated form of the indicator

HX = protonated form of the indicator

When a single...

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Acids and Bases

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Chapter 2 / Lesson 10
40K

Acids are substances that contribute molecules, while bases are substances that can accept them. Learn how to define acids and bases, explore the pH scale, and discover how to find pH values.


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