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Test Tube

Chapter 6 - What Are The Mechanisms Of Chemical Change?

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Atom Symbol

Chapter 1 - Models Of The Particulate Nature Of Matter

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Chapter 2 - Models Of Bonding & Structure

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 Globe with Meridians

Chapter 3 - Classification Of Matter

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Fire

Chapter 4 - What Drives Chemical Reactions?

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Rocket

Chapter 5 - How Much, How Fast & How Far?

<ul>
	<li>They are the chameleons of the chemistry world! 🦎</li>
	<li>They&#39;re weak acids or bases that change color depending on the pH.</li>
</ul>

<ul>
	<li>Let&#39;s imagine an indicator called HInd (just a made-up name for our example).</li>
	<li>If HInd is a weak acid, it can split up (or dissociate) in water: HInd(aq) ⇌ H+(aq) + Ind&minus;(aq)</li>
	<li>On the left: Protonated form (HInd). Think of it like a lemon, sour and full of H⁺.</li>
	<li>On the right: Conjugate base (Ind⁻). Imagine a squeezed lemon; the sour H⁺ has been removed!</li>
</ul>

<ul>
	<li>When the pH is much lower than pKa (acidic like lemon juice 🍋)
	<ul>
		<li>Our indicator, HInd, is mainly in its protonated form.</li>
	</ul>
	</li>
	<li>When pH is much higher than pKa (basic like baking soda)
	<ul>
		<li>The indicator loses a proton, becoming Ind⁻.</li>
	</ul>
	</li>
</ul>

💥 Real-world example: Think of HInd as a mood ring that changes its color based on the &quot;mood&quot; (or pH) of the solution.

<ul>
	<li>If HInd and Ind⁻ reflect light differently, they show different colors. It&#39;s like wearing two different shades of sunglasses 🕶️!</li>
	<li>Each indicator changes color in a specific pH range, usually from pKa&minus;1 to pKa+1. This is called the transition range. Some can be narrower or wider, though.</li>
</ul>

💡 Fun fact: There&#39;s something called the universal indicator. It&#39;s like an artist&#39;s palette 🎨 of indicators mixed together. Instead of just showing one color transition, it changes colors gradually through the whole pH scale from 0-14. So, it&#39;s like having a rainbow 🌈 in a bottle!

<ul>
	<li>Titration Time! In titration experiments, indicators act like the traffic lights 🚦 of chemistry.</li>
	<li>When the color changes, it&#39;s the end point of the titration.
	<ul>
		<li>This change is tied to the pKa of the indicator.</li>
		<li>Basically, the pKa gives a hint about the pH where the color switch happens.</li>
	</ul>
	</li>
</ul>

Acid-base indicators are the color detectives 🕵️&zwj;♂️ in chemistry. Whether you&#39;re doing a titration or just curious about pH, they&#39;ve got your back, helping you spot pH changes with a splash of color! 🎉🌈🔍🔬

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Hope these notes make your chemistry journey a colorful adventure! Always remember: Chemistry is everywhere, from the food you eat to the air you breathe.

&nbsp;

Happy studying! 📘🎉

Chapter 6 - What Are The Mechanisms Of Chemical Change?

Unlock Chemistry: Acid–Base Indicator Guide

Table of content

Introduction to Acid-Base Indicators 🌈

How do they work? 🖼️

Color Play with pH 💡

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Chapter 6 - What Are The Mechanisms Of Chemical Change?

Unlock Chemistry: Acid–Base Indicator Guide

Table of content

Introduction to Acid-Base Indicators 🌈

How do they work? 🖼️

Color Play with pH 💡

Unlock the Full Content!