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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>pOH Scale: Represents the basicity of aqueous solutions.</li>
	<li>Basic Solutions: Have high concentrations of OH&minus; ions &amp; low pOH values.</li>
	<li>Acidic Solutions: Have low concentrations of OH&minus; ions &amp; high pOH values.</li>
</ul>

<ul>
	<li>pOH is like a twin to pH, but it measures the basicity of a solution instead of acidity!</li>
	<li>Mathematically: pOH = &minus; log[OH&minus;] 
	[OH&minus;] = 10&minus;pOH</li>
</ul>

<ul>
	<li>It&rsquo;s super handy for solutions of Arrhenius bases.</li>
	<li>It simplifies our representation and calculations! For example, saying &quot;pOH = 14&quot; is simpler and clearer than &quot; [OH&minus;] = 1.00 &times;10&minus;14 mol dm&minus;3&quot;.</li>
</ul>

<ul>
	<li>Like the pH scale, the pOH scale is logarithmic!</li>
	<li>Logarithms let us add and subtract instead of multiplying and dividing. That&#39;s way easier, right?</li>
</ul>

<ul>
	<li>Let&rsquo;s see how to calculate pOH with real examples: Potassium Hydroxide (KOH) &amp; Sulfuric Acid (H2SO4).</li>
</ul>

a. For KOH: pOH = &minus;log⁡ (0.025) &asymp; 1.60pOH = &minus; log(0.025) &asymp; 1.60

b. For H2SO4

<ul>
	<li>Since H2SO4 gives two H+ ions, [H+] is double the concentration of H2SO4. pOH &asymp; 12.70pOH&asymp; 12.70</li>
</ul>

<ul>
	<li>Imagine you have two drinks: Lemon Juice (Acid) and Baking Soda Solution (Base).</li>
	<li>Lemon juice would be high on the pH scale, and the baking soda solution would be high on the pOH scale!</li>
</ul>

a. For Ba(OH)2 Solution

<ul>
	<li>Find the pOH of a 5.0 &times; 10&minus;3&nbsp;moldm&minus;3 solution.</li>
	<li>Hint: Don&rsquo;t forget, Ba(OH)2 gives two OH&minus; ions!</li>
</ul>

b. For a Solution with pOH = 4.70

<ul>
	<li>Find the concentration of OH&minus; ions!</li>
	<li>Hint: Use the pOH formula backwards!</li>
</ul>

<ul>
	<li>Remember, the lower the pOH value, the more basic the solution is.</li>
	<li>Practice the logarithm calculations to get a good grip on them.</li>
	<li>Experiment with different solutions to see how pOH values vary, but remember to stay safe!</li>
</ul>

<ul>
	<li>pOH represents the basicity of solutions.</li>
	<li>It&rsquo;s important for solutions of Arrhenius bases.</li>
	<li>It&rsquo;s a logarithmic scale, making calculations simpler!</li>
	<li>Lower pOH values mean more basic solutions.</li>
</ul>

You can see the effect of high pOH in real life when you mix baking soda and vinegar and observe the fizzy reaction!

Chapter 6 - What Are The Mechanisms Of Chemical Change?

Unlock The Secrets Of pOH Scale!

Table of content

Concepts

What is pOH? 🧐

Why is it Useful? 🤔

Fun Fact!🎉

Real-world Example & Calculation 🧠

Unlock the Full Content!

Chapter 6 - What Are The Mechanisms Of Chemical Change?

Unlock The Secrets Of pOH Scale!

Table of content

Concepts

What is pOH? 🧐

Why is it Useful? 🤔

Fun Fact!🎉

Real-world Example & Calculation 🧠

Unlock the Full Content!