W hat I ’m L ooking F or:
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W hat I ’m L ooking F or: Learning Objectives : All: I can use the pH scale to tell how strongly acidic or alkali a substance is. All: I can give examples of common acids and alkalis in the home (HSW) Most: I can explain why some common household products need to be alkali. (HSW). Most: know what type of chemical makes common household products alkali Some: I know what ions are make something acidic or alkali PLTS: Self- managers Date: 24/06/22 Key Words Strong Weak pH scale Universal Indicator Hydroxide KS3
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Date: 17/08/2014. KS3. Title:. The pH Scale. W hat I ’m L ooking F or:. PLTS: Self-managers. Learning Objectives :. All: I can use the pH scale to tell how strongly acidic or alkali a substance is. All: I can give examples of common acids and alkalis in the home (HSW) - PowerPoint PPT Presentation
Transcript of W hat I ’m L ooking F or:
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What Im Looking For:All: I can use the pH scale to tell how strongly acidic or alkali a substance is.
All: I can give examples of common acids and alkalis in the home (HSW)
Most: I can explain why some common household products need to be alkali. (HSW).
Most: know what type of chemical makes common household products alkali
Some: I know what ions are make something acidic or alkali
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Universal Indicator and the pH scaleUniversal Indicator is a mixture of liquids that will produce a range of colours to show how strong the acid or alkali is:weak acidweak alkali
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Aim: To use universal indicator paper to find out how strongly acidic or alkali different household substances are.
1 Cut up and arrange the indicator paper in on a white tile.2 Dip a glass rod into your first test solution.3 Touch the pH paper with the glass rod and record its colour.4 Use the colour chart to decide on the pH.5 Fill in your table of resultsGoggles !!!!!!
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Universal Indicator and the pH scaleUniversal Indicator is a mixture of liquids that will produce a range of colours to show how strong the acid or alkali is:Stomach acidLemon juiceWaterSoapOven cleanerBaking powder
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The pH scaleUniversal Indicator will produce a range of colours to show how strong the acid or alkali is:Cleaning fluids are made alkali by adding metal HYDROXIDES. This dissolves the fat and grease.Toothpaste contains Sodium Hydroxide to neutralise (cancel out) the acid in food.Milk of Magnesia contains Magnesium Hydroxide to neutralise the acid in our stomach.
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Neutralise = cancel out
Ex: Alkali chemicals are neutralised by acids.
=bring the pH towards 7
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Acids (contain Hydrogen)
Strong acids are corrosive eating away at things like metal, stone and flesh!
Weak acids, like lemon juice and vinegar, taste sour.AlkalisBases are substances that neutralise (cancel out) acids.Alkalis are soluble bases.Alkalis may be corrosive, harmful or irritant. Cleaning products are usually alkali as alkalis dissolve grease and fat.Toothpaste is a base which cancels out the acid produced by bacteria on your teeth.
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ABCDLevel 5
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Level 5
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Level 4
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Level 4ABCD
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Level 4
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Level 4
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Will it be acidic, basic or neutral and how strong?very weak acidvery strong acidvery weak alkaliweak alkalistrong acidvery strong alkaliweak acidIndicators: the pH scale
Substance pHDescription of acid / alkaliSoda water6Car battery acid1Soap8Washing soda10Stomach acid2Oven cleaner14Vinegar4
