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Do now! Don’t forget you have a digestion test on Friday. Do some study whilst you are waiting.
Last lesson Making and investigating indicators
Making an Indicator SubstanceColour (neutral) Colour with acid (HCl) Colour with alkali (NaOH) A good indicator ? Red cabbage purpleredgreenYes! Beetroot purple No! Coffee brown No!
Today’s lesson Measuring the strength of acids and alkalis The pH scale Using “Universal Indicator”
The pH scale The strength of an acid is measured on the pH scale pH stands for the “potential of hydrogen”
The pH scale pH stands for the “potential of hydrogen” strong acid weak acid weak alkali Strong alkali
To measure pH, we need an indicator that has a different colour for each value of pH Universal Indicator
It comes in the form of a paper
Universal Indicator It also comes in the form of a liquid
Measuring pH You are now going to measure the pH of various acids, alkalis and household liquids.
Measuring pH SubstancePredicted pH Colour of Universal indicator Actual pH
Safety in the Lab What is different about this classroom and every other classroom in your school?
Do now! Can you spell the following words CORRECTLY in your book? Newtralisation, asid, alcali, litmas, indicater.
PH (potential of Hydrogen). According to the Bronsted-Lowry theory, both acids and bases are related to the concentration of hydrogen ions. Acids will.
PH The wonders of water!. Acids Any compound that GIVES OFF H+ ions in solution Any compound that GIVES OFF H+ ions in solution Ex. HCl H+ and Cl- Ex.
Learning outcomes: To know what the pH scale is. Know how to measure pH Give examples of different acids and alkalis. Read page 56 and 57.
Red Cabbage PH Indicator
Year 7 starter: THINK of a sentence using at least 2 of the following keywords indicator red acid purple colour green alkali neutral bleach lemon juice.
KS 3 laboratory Indicators De Lisle Catholic Science College Science department.
Do now! Can you spell the following words correctly in the back of your book? Nuetralisasion, indicater, litmas, alkcali, burete.
# 4 Acids and Bases. Number your paper Answer the questions. 1. What does “pH” stand for ? 2. Who invented the pH scale? 3. Describe 2 things that.
Lecture 152/22/06 Topics due. Neutralization: Acid + Base = Water + Salt pH of neutralized solution? Strong Acid + Strong Base HCl (aq) + NaOH (aq)
Acids and Alkalis. Hazard signs to learn… hi Acid HarmfulIrritant Corrosive.
Strength of Acids and Bases. What makes a strong acid or base? The strength of an acid or base is based on how many acid or base particles break down.
The pH Scale.
Acids, Bases, and the pH scale. Acids Acids pH of 0 - < 7 pH of 0 - < 7 React with metals and Bases React with metals and Bases Tend to taste sour Tend.
ACIDS AND BASES. Acids Acidic solutions contain water and hydrogen ions (H+)
Indicators 1.Indicators are dyes which change colour when acidic or alkaline solutions are added to them. 2.Some common indicators are litmus, methyl orange,
Acids, Bases, and pH Chapter 9 Section 1.
The chemical of life. Acids Sour taste, leaves burning sensation Increase hydrogen ions (H+) in solution.
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