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Use Le Châtelier's principle to explain why bromocresol green is blue if you dissolve it in a base solution, such as 0.10 $\mathrm{M}$ sodium hydroxide, NaOH.

If a base is added to a solution with an indicator, $\left[H^{+}\right]$ decreases. The system responds by making more product ions, $H^{+}$ and $I n^{-} .$ Thus solution color of $I n^{-}$ which is blue.

Chemistry 102

Chemistry 101

Chapter 24

Changing Conditions

Section 1

Applying Le Chatelier’s Principle

Chemical Equilibrium

Intro to Chemistry

Chemical reactions and Stoichiometry

University of Central Florida

Rice University

Drexel University

Lectures

03:07

A liquid is a nearly incom…

04:38

A liquid is a state of mat…

00:36

Explain, using Le Châtelie…

02:28

Use Le Châtelier's pr…

01:49

01:57

What would happen to the c…

01:32

Explain, using Le Chatelie…

00:25

Predict the color of the f…

03:10

When chlorine reacts with …

01:36

01:12

Apply Concepts Use the ion…

02:17

Compare the pH values for …

using less Italians principle. Let's explain why Brown Chris Hall green is blue if we dissolve it in a base solution, so we're gonna dissolve it in 0.1. Moeller sodium hydroxide 0.1 mole sodium hydroxide has a hydrogen ion concentration of 0.1. Moeller tackling the P O. H, which is equal to negative log 0.10 This will be equal to 1.0 and the pH would be equal to 14 minus 1.0 so the Ph would be 13.0 Now let's look at Drumcree Saw green from previous. All green can be represented by the generic indicated equilibrium expression. Here, the acid form for from Krystle Green is yellow and the base form for or bomb Krystle Green is blue. We know that the equilibrium constant for a broom crystal green is 1.3 times 10 to the negative. Five. Let's calculate the peak. A, which will be the transition point of the indicator. Negative log 1.3 times 10 to the negative five. This will be equal to 4.89 Therefore, at a Ph below 4.89 we would favor the H i n, which would be yellow in color at a pH above 4.89 We would favor the base for my end minus, and we know that this is blue in color. So in a base 0.1 Moeller sodium hydroxide, it's PHS 13, which is greater than 4.89 So the, um if we look at this here the base 0.1 Moeller any ohh has a pH greater than 4.89 And that is why in a base we will see the color blue exhibited for Brome Krystle um from Krystle Green.

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