Learning objectives. Explain why clean water is essential Explain how and why water is purified Explain why purification leaves soluble salts in water.

Slides:

Advertisements

Similar presentations

Qualitative Analysis Chemistry. What is qualitative analysis Qualitative analysis is used to determine the chemical composition of an unknown substance.

Advertisements

TESTING FOR CATIONS QUALITATIVE ANALYSIS.

Lesson 5 Learning Objectives: Describe the test for specific negative ions Explain how precipitation reactions can be used as the test for some ions.

Precipitate Reactions L.O. I can state which are spectator ions in a precipitation reaction. I can make a clean dry precipitate and write the ionic equation.

Unit 1 – Day 12 Solubility Rules.

CHEMISTRY DEPARTMENT WAID ACADEMY Standard Grade Topic 9.

Testing for cations Lesson 11.5.

Topic 9 Reactions of Acids.

C4 Lesson 16 – Testing Water. After studying this topic, you should be able to: recall the tests for sulfate ions and halide ions in water write word.

Salt soluble? yes, then choose an acid and a base base soluble? yestitrationno excess base no precipitation choose two soluble salts.

ACIDS AND BASES. Acids  Acidic solutions contain water and hydrogen ions (H+)

Ions In Solution.

Learning Objectives: Describe and explain the tests for ions using sodium hydroxide solution Explain how precipitation reactions can be used to test for.

Lesson  We used sodium hydroxide and ammonia to identify positive ions.  We can carry out test to identify negative ions.  Negative ions are.

7.3 Making salts from solutions Soluble or insoluble? What do these terms mean? 17 September 2015 Fertilisers Water Treatment.

Electrolysis To revise electrolysis of molten compounds: aluminium oxide To revise electrolysis of aqueous solutions: brine and copper sulfate.

C2- Chemistry Analysing substances, making salts, acids and bases

Preparation for Practical chemistry Exercise on Chemistry Paper 4= 2014= form 5.

Semi Qualitative Analysis NEGATIVE IONS. Qualitative analysis is used to separate and detect cations and anions in a sample substance Most of the chemicals.

Salts By Amy Badger.

2j Preparing and analysing. Last lesson - Precipitation reactions Reactions that produce an INSOLUBLE SALT.

Chemical tests to identify anions

2j Preparing and analysing

Forensic Science 4.7 Testing For Ions. Learning outcomes Be able to test for positive and negative ions Be able to name a compound after identifying it’s.

Lab Tests, results, and Sulphuric acid Tes lab, hasil, dan asam sulfat

Types of Reactions. In Chemistry, we can identify a lot of different types of chemical reactions. We can put these chemical reactions into groups, so.

Some Terminology Soluble – Will dissolve in a solvent Insoluble – Will not dissolve in a solvent Solvent – The substance that dissolves the solute Solute.

Making salts (3): precipitation. Soluble or insoluble? Insoluble salts are made by mixing two soluble compounds. The solid obtained when solutions of.

What does soluble and insoluble mean?

Compounds in Aqueous Solutions When dissolved in water, ionic and molecular compounds behave differently.

Fertilisers IGCSE Chemistry

A cids Bases & Salts (Salts) an e-learning series by ycs.

Identifying Ions Noadswood Science, 2013.

How can we test for the presence of positive and negative ions?

Solubility Noadswood Science, 2012.

Diluting a solution Amount of moles of solute before dilution Amount of moles of solute after dilution = c D V D = c C V C Practice problems: p. 321.

Precipitation reactions and calculating % Yield To carry out and record results for a precipitation reaction To calculate the % Yield.

Reactions in Aqueous Solution Chapter 9 Section 3.

A cids Bases & Salts (Bases) an e-learning series by ycs.

IGCSE CHEMISTRY SECTION 2 LESSON 5. Content The iGCSE Chemistry course Section 1 Principles of Chemistry Section 2 Chemistry of the Elements Section 3.

AS Revision Lessons Identification tests.

Inorganic Analysis Fish!. Pick a question!

EDEXCEL C2 Lesson 5 – Solubility Mrs Barnes CCYD

C2 7.3 Making salts from solutions (aq) (l) The indicator shows when the acid and alkali have completely reacted …... L/O How we * make salts from acids.

Making insoluble salts

Precipitate Testing.

Acids and Alkalis.

Learning objective: To be able to identify chemical species from their characteristic behaviour 22/05/2018 Anions Sulfate (SO42-): Add dilute hydrochloric.

Tests for Oxidising / Reducing Agents

Halide Anion Tests.

AN INTRODUCTION TO GROUP VII.

Qualitative Analysis Reactions that produce an INSOLUBLE SALT.

Lab Tests, results, and Sulphuric acid

Tests for Ions Sunday, 11 November 2018

Identifying Compounds

Reactions of the halogens and halide ions

5. Testing for Ions Name of metal ion

Inorganic Analysis Fish!.

How to Prepare an Insoluble Salt (precipitate) by Precipitation

Title: Reactivity of Halide Ions

Chemical Analysis.

Chemsheets AS006 (Electron arrangement)

TESTING FOR CATIONS QUALITATIVE ANALYSIS.

Question: How do we know what ions are present in a solution?

MAKING SALTS 21/06/2019.

PRACTICAL METHODS FOR MAKING SALTS: Learn THIS!

PRACTICAL METHODS FOR MAKING SALTS: Learn THIS!

Presentation transcript:

Learning objectives. Explain why clean water is essential Explain how and why water is purified Explain why purification leaves soluble salts in water Give 3 sources of water (not taps!) Give 3 ways that water is used as a resource. Give some reasons why water must be purified before it is used. List some of the pollutants found in tap water. Describe how water can be purified, explain how each stage works and the impurities that are removed at each stage Should all dissolved substances be removed from water? outube.com/ watch?v=9z 14l51ISwg

a)The removal of large insoluble materials is …….. b)Adding chemicals to make particles stick together and sink is …….. c)Adding a toxic gas to destroy microbes is ………..

Water used to dissolve other chemicals Water used to cool power stations  Water used to make other chemicals raw material solvent coolant

Add sodium hydroxide solution and aluminium powder to the solution containing the nitrate ions. The aluminium reduces the nitrate ion (NO3-) to an ammonium ion (NH4+). The ammonium ion reacts with hydroxide to produce ammonia gas and water. ammonium + hydroxide ammonia + water NH4+(aq) + OH-(aq) NH3(g) + H2O(l) Ammonia gas can be identified using damp red litmus paper. Testing for the presence of NITRATE ( NO3-) ions.

Testing for the presence of impurities in water. Water supplies are often contaminated with impurities. Insoluble substances can be filtered out of the water but soluble substances such as minerals are harder to remove. Tests can be carried out to determine the presence of the soluble contaminants. Precipitation reactions can be used to identify the contaminants.

1.To identify the presence of HALIDE ions; You will need test tubes containing sodium chloride solutionCl - sodium bromide solution Br - sodium iodide solutionI - Add a few drops of silver nitrate solution. Record the colour of the precipitate formed. 2.To identify the presence of Lead Pb 2+ ions; You will need a test tube containing lead nitrate solution Add a few drops of potassium iodide solution. Record the colour of the precipitate formed. 3.To identify the presence of Sulphate SO 4 2- ions; You will need a test tube containing sodium sulphate solution Add a few drops of barium chloride solution. Record the colour of the precipitate formed.