The pH Scale and Neutralisation

Name: The pH Scale and Neutralisation
Author: StemPy Lab

How acidic is lemon juice? How basic is soap? The pH scale gives a number. In this course we learn the scale, we see why it matters for the stomach, the teeth, the soil and insect stings, and we calculate how much acid neutralises a base.

3 lessons, about 1 h 15 min3 simulations10 problems6 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 25 min
The pH scale
The pH scale runs from 0 to 14. It measures how many hydrogen ions a solution has. A pH below 7 is acidic, 7 is neutral and above 7 is basic. A change of one unit in pH is a tenfold change in the concentration of hydrogen ions.
1 simulation2 practice questions1 Python program3 problems1 Python lab
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Lesson 2about 25 min
Acids and bases in daily life
Blood has a pH of about 7.4, and the stomach makes hydrochloric acid of pH about 1.5 to help digestion. Too much stomach acid causes indigestion, and an antacid, which is a mild base such as magnesium hydroxide, neutralises it. Tooth enamel dissolves below pH 5.5 when bacteria make acid from sugar, and basic toothpaste helps. A bee sting has acid, so a mild base gives relief, while a wasp sting is basic and vinegar helps. Farmers add lime to acidic soil. Rain is naturally about pH 5.6, and below that it is acid rain.
1 simulation2 practice questions1 Python program4 problems1 note
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Lesson 3about 25 min
Neutralisation calculations
In neutralisation, the moles of H+ equal the moles of OH-. For an acid and a base that react one to one, the volume needed is found from the concentrations and the volume of the other. In a titration, the pH rises sharply near the point of neutralisation.
1 simulation2 practice questions2 Python programs3 problems1 Python lab1 question set
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pH and Daily Life: Chapter Test

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The pH Scale and Neutralisation

Course outline (3 lessons)

The pH scale

Acids and bases in daily life

Neutralisation calculations

Test Your Learning

Your teacher

Discussion (0)

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