Name: ___________________ ( ) Class: 2A

Slides:



Advertisements
Similar presentations
Red Cabbage PH Indicator
Advertisements

Noadswood Science, Sunday, October 12, 2014  To know how flame tests, the pH scale and solubility helps analytical scientists.
Chemical Tests for Glucose, Starch, Proteins and Fats.
Experiment: To examine the effect of pH on the digestion of protein by pepsin. Apparatus: Hard-boiled egg-white cut into ¼ inch (or 1 cm) cubes or liquid.
Acids and Alkalis Name_____________________. Universal Indicator and the pH scale Below 7 is _____ Above 7 is _________ Exactly 7 is _________ Universal.
Acids and Alkalis Can you think of some common, household acids and alkalis? AcidsAlkalis Vinegar Fruit Juice Baking Soda Indigestion Powder Oven Cleaner.
Chemistry My family and home 03/07/2015. Acids and bases (alkalis) Used by the body, used in other processes: such as food, farming and chemical industries.
Acids and Bases Vanderbilt Student Volunteers for Science Training Presentation Spring 2014.
ACIDS AND BASES. Acids  Acidic solutions contain water and hydrogen ions (H+)
Neutralisation Noadswood Science, 2012.
Lesson: Acids and Bases
PH Friday, 18 September Metals with Hydrochloric Acid 2 hydrogen+magnesium chloride  hydrochloric acid +magnesium Mg+HCl  MgCl 2 +H2H2 No reaction.
Unit 10 Unit 10 Summary check-point Unit 10 Unit 10 Summary check-point.
Acid Rain 8A1 Thursday 11 December Learning Intentions  At the end of this lesson, you will be able to:  Describe how acid rain is formed  Identify.
Acid and bases Bases.
COMMON SENSE IS LIKE DEODORANT, THE PEOPLE WHO NEED IT THE MOST NEVER USE IT.
Acids and Alkalis Grade 10. Acids Sour Turn litmus red pH less than 7 Dissolve carbonate rocks Corrode metals Conduct electricity.
Acids and Alkalis LO: Describe what happens when acids are mixed with water (D) Explain what is making a solution acid or alkali (C) Investigate acids.
Lab 25Date: Red Cabbage Indicator Purpose To prepare and test red cabbage as an indicator. Red cabbage and many other plants contain a water-soluble pigment.
Revision Quiz Acids 1 1.What is the pH scale? 2.What numbers on the pH scale show an acid? 3.What is an indicator? 4.What number is neutral? 5.What colour.
weak bitter corrosive base digest hydrochloric strong stomach
Solubility Noadswood Science, 2012.
Acids and Bases Chapter 32.
Acids and Bases Vanderbilt Student Volunteers for Science Training Presentation Fall 2015 VINSE/TnScore.
Unit 10 – Common Acids and Alkalis ETV. Not everything is edible. Human is not sensitive towards acids and alkalis. Acids are tasteless. Alkalis are tasteless.
ACIDS AND BASES REVISION Q3. A STUDENT HAS THREE UNLABELLED BEAKERS EACH CONTAINING A COLOURLESS LIQUID. ONE CONTAINS WATER, ONE CONTAINS A SOLUTION OF.
Learning Objectives Acids and Alkalis
Acids and Bases Mini Lesson
Chemical Changes and Structure
Universal Indicator can be used to find the pH of a solution
Universal Indicator can be used to find the pH of a solution
Making salts lesson 2.
Electrolysis uses electrical energy to break down (decompose)
7.2 THE STRENGTH OF ACIDS AND ALKALIS
Tests for Oxidising / Reducing Agents
Dilution and Reactions of Acids
Handle acid with care!.
Acids and Alkalis Grade 10.
Making salts All Must: Be able to describe how to neutralise an acid
Name: ___________________ ( ) Class: 2A
Acids and bases.
Acid and Bases Chapter 24.
Acids and Bases.
NEUTRAL. NEUTRAL Chemical reaction to make... Use a neutralisation Chemical reaction to make... ? UNKNOWN DISCOVER.
UNIT 1 ACIDS, ALKALIS & CHEMICAL REACTIONS Lesson 2 – pH paper
UNIT 1 ACIDS, ALKALIS & CHEMICAL REACTIONS Lesson 1 - Introduction
Acids and bases F Acids and bases pH — measuring acidity
What is an acid? Here are some facts about acids.
Acid and Bases. pH.
Acid and Base Jeopardy! Begin.
Acids, Bases & pH.
Introduction to Acids and Bases.
Acids produce H+ in solution,
Acids, Bases and Salts In this section we look at the properties of acids and bases, find out what salts are, and how to prepare them.
Acids and Bases Chapter 32.
Teacher’s Notes A slide contains teacher’s notes wherever this icon is displayed - To access these notes go to ‘Notes Page View’ (PowerPoint 97) or ‘Normal.
Red Cabbage Indicator Year 7 Science.
Acids & Alkalis Crossword
Acids and Bases Mini Lesson
Chemical Analysis.
Acids and Bases.
1.2 Acids and Bases.
Explain pH and how neutralisation occurs
Learning Objectives 1/11/07 Acids and Alkalis
Learning Objectives Acids and Alkalis
Week 6 – Acids and Alkalis
Year 7 multiple-choice main test 7E Acids and alkalis
Presentation transcript:

Name: ___________________ ( ) Class: 2A Acid and Alkali Name: ___________________ ( ) Class: 2A Materials required per student: Universal indicator 2 pcs of filter paper 3 pcs droppers (labelled 1,2 and 3) – to save time on washing up between steps 1 Test tube Dilute HCl 2M NaOH Sample X (2M HCl)

Acid rain Acidic gases dissolve with water droplets in clouds 2 Acidic gases dissolve with water droplets in clouds 3 Water droplets falls as acid rain 1 Acidic gases such as sulfur dioxide and oxides of nitrogen released into the air

Acid Rain Effects: Acidification of soil, ocean and sea Soil becomes acidic and affects growth of plants Sea creatures affected as sea and ocean becomes acidic Corrode buildings made of metal and calcium carbonate Loss of heritage buildings

Colour of universal indicator pH pH is a measurement of solution to determine if it is acid, alkali or neutral. Teacher’s demo with Universal indicator: Solution Colour of universal indicator pH Acid red 1-3 Alkali blue 10-12 Water Green 7-8

Acid and Alkali Place a piece of blue litmus paper and red litmus paper on a clean filter paper. Using dropper 1, place a drop of hydrochloric acid on both strips of litmus papers. Record your observation: Blue litmus paper: turns red Red litmus paper: remains the same Clean filter paper is used instead of white tile to save time on washing up for next step

Acid and Alkali Place a piece of blue litmus paper and red litmus paper on a clean filter paper. Using dropper 2, place a drop of sodium hydroxide on both strips of litmus papers. Record your observation: Blue litmus paper: remains the same Red litmus paper: turns blue

Acid and alkali pH 1-6: Acid pH 7: Neutral pH 8-14: Alkali

Acid and alkali Universal indicator Litmus paper test 1 2 3 4 5 6 7 8 orange/ yellow red blue purple green 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Acid Neutral Alkali Turn blue litmus paper red Turn red litmus paper blue Litmus paper test

Scenario Imagine you are an environmental consultant. Farmer Bob has a farm which has been experiencing poor plant growth over the past 2 years. He decided to consult you regarding this.

Identify problem You have been provided Sample X, a sample of the soil from the farm. Conduct necessary tests to determine the problem. Sample X: 2M HCl

Identify problem Place a piece of blue litmus paper and red litmus paper on a clean tile. Using dropper 3, place a drop of Sample X on both strips of litmus papers. Record your observation: Blue litmus paper: turns red Red litmus paper: remains the same Conclusion: The soil is * acidic/alkali (circle the correct answer)

Recommendation Farmer Bob should add alkali solution to gradually increase the pH of the soil to pH 7. This process is called neutralisation.

Neutralisation Using a syringe, add 1 ml of soil sample X into a test tube. Put 2 drops of Universal indicator. (Colour of Universal indicator: ____red___) Shake the test tube. Using a dropper, add sodium hydroxide drop by drop until it changes colour. Shake the test tube after every drop. After it changes colour, allow it to stand for 2-3 minutes. X: 2M HCl 2M NaOH

Neutralisation Results: No of drops needed: ____ Observation: Universal indicator changes colour from _red_ to __blue__. After a few minutes, it changes colour to _green_. Conclusion: Soil sample change from ___1-3___ to ____7____. About 20 drops

Conclusion For every 1 ml of soil, Farmer Bob should add ____ drops of sodium hydroxide to neutralise the soil.