2018 Acids And Bases Ppt - Cinnaminson Middle School

How does he do this magictrick?https://www.youtube.com/watch?v ujkuW-0cpNw&t 32s

Acids and BasesTwo special classes of compounds

Elements Contain a single kind of atom

Compounds Substances that are chemically formed They have physical and chemical properties that are differentfrom the elements that make them up. They are formed as the result of a chemical reaction.

Hydrogen (an explosive gas)and oxygen (an explosive gas)combine to form thecompound water (a harmlessliquid).Here, the hydrogen gas in thezeppelin SS Hindenburg reactswith oxygen in the air tomake water.Source: Photo courtesy of the US burg burning.jpg.

Acids and Bases Acids and bases are special classes of compounds thatexhibit common chemical properties.

Acids and Bases Acids and Bases can be helpful or harmful. Acids and bases can be weak or strong. YOU MUST ALWAYS BE CAREFUL WHEN WORKINGWITH ANY CHEMICALS!

Characteristics of Acids Have a sour taste (never taste anunknown!) They have Hydrogen atoms whichhave given up their electron,making them positive ions. (H )

Characteristics of Acids They turn blue litmus paper red They react with metals to releaseHydrogen gas.http://www.youtube.com/watch?v PqUOGc6P05c

What is an ion?An ion is an atom that has lost orgained an electron giving it apositive ( ) or negative (-) charge.

USES OF ACIDS Citric acid and ascorbic acid (Vitamin C)are found in orange juice Carbonic acid and phosphoric acid give a“bite” to soft drinks Acids in your stomach aid in digestion Sulfuric acid is the most widely usedindustrial acid in the world. It is used inmaking metals, paper, paints, andfertilizers.

Sulfuric Acid on a Sponge

Characteristics of Bases Have a bitter taste (never taste anunknown!) They feel slippery

Characteristics of BasesThey have Hydroxide (OH) compounds which have taken on anelectron, making them negative ions. (OH-)

Characteristics of Bases They turn red litmus paper blue They do not react with metals.

Uses of Bases Bases are used in soaps(remember, bases are slippery) Bases are used to make paper, inoven cleaners, and to unclogdrains Ammonia is a base and is used inmany household cleaners

Detecting Acids and Bases You can detect an acidusing an indicator. INDICATOR - Asubstance that changescolor in the presence ofan acid or a base.

INDICATORS Litmus paper is an indicator An acid turns blue litmus paper red A base turns red litmus paper blue Universal test papers can identifyacids and bases

INDICATORS Cabbage juice can also be used as anindicator. The juice should turn pink in acidicsolutions, and green/blue/yellow inbasic solutions.

Turn and talk- how does hedo this magic trick?https://www.youtube.com/watch?v ujkuW-0cpNw&t 32s

How do we measure the strength ofan acid or base?Use the pH (Powers of Hydrogen) scale

pH scale Acids and Bases areranked on a pH scale. 0-6.9 acids, lots of H ions 7.1-14 bases, lots ofOH- ions

Lots of H Acid low pHLots of OH- Base high pH What happens if you have a perfect balance of H and OH-? HOH Or H2O Water!

Pure Water (H2O) is a perfect balance of theH ions and OH- ions Pure water is a 7 on the pH scale, it is called Neutral

Common products and pH range

Summary of Characteristics of Acid and BaseCompoundshttp://www.youtube.com/watch?v tNvP3-174 M

Question #1 Lemon juice has a pH of2.2. Is it an acid or abase? acid

Question #2 Detergents such as Tidehave a pH of about 10.Is Tide an acid or abase? base

Question #3 Seawater has a pH of 8.2.Is seawater an acid or abase? base

Question #4 The inside of your mouthhas a pH of 7. Is it an acidor a base? neutral

Question #5 How do you think we cameup with the term “acidrain”? Rain water has a pH lessthan 7

Question #6 409 cleaner containsammonia that has a pH of12. What will 409 do tored litmus paper? Turn blue

Question #7 A soft drink has a pH of3.2. What will it do to apiece of red litmuspaper? Stay red

Question #8 What is a physical orchemical property of anacid? Tastes sour, has a pHbelow 7, turns litmuspaper red, produces H ions

Question #9 What is a physical orchemical property of abase? Tastes bitter, feelsslippery, has a pH above7, turns litmus paperblue, produces OH- ions

Question #10 What is a physical orchemical property ofwater? Liquid at roomtemperature, colorless,has a pH of 7 (is neutral)

pH of Everyday SubstancesCopyright 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings

Practice Acid/Base ducational-movies/free-online-movies.php?movie Acids%20And%20Baseshttp://www.youtube.com/watch?v ujkuW-0cpNwMagic tricks with Acids and Bases

How can I tell if something is an acid or abase? You can taste it (NEVER do this in a chemistry lab) You can find its pH using a pH test paper 0-6 Acid7 water/neutral 8-14 base You can use an indicator Red or blue litmus paper cabbage juice indicator

Goggles on Tear a piece of red litmus paper into threepieces and put them in the tray. Tear a piece of blue litmus paper intothree pieces and put them in the tray. Tear a piece of orange universal pH paperinto three pieces and put them in the tray. Drop vinegar on the first row (an acid) Drop water on the second row (neutral) Drop baking soda on the third row (a base) Make observations and record data Clean upProceduresVinegarWaterBakingSoda

Safety Warnings: Use your safety contract tohelp you.1.2.3.4.5.6.Wear gogglesNo horseplay, follow directionsDo not touch, taste, smell unknown liquidsWear apron, roll up sleevesClean up when finishedWatch for broken glass, report spills

Record your observations and conclusionsbaking soda

Unknown Acid/Base/Neutral Identification labWorth 25 pointsObjectives: Can you use your knowledge of acids andbases to identify 3 unknown substances usingindicators?1.2.3.4.5.Follow all previous safety guidelinesRead your proceduresDesign a data table for three unknown lettered testtubes - get teacher initialsConduct your testing and record your observationsForm your conclusions and complete review sectionABC

Data –what information will you collect aboutthe three substances? Organize a chart to putthe data into.Sample ASample BSample C

Writing a lab Create a descriptive title for your experiment: Problem: How can an unknown liquid be identified as an acid, abase, or a neutral substance? Background Information: Acids and bases are special classes ofcompounds that have their own unique characteristics. Acids aretasting, have H ions, turn blue litmus paper, and they react with . Bases have ataste, feel slippery, have OH- ions, and turn redlitmus paper .

Materials: What materials do you need tocomplete this lab?Goggles, apron, beakers, red and blue litmus paper, sampletray, three unknown liquids, pH paper, droppers, lab sheet

Procedures –what are the steps you need tofollow to correctly identify an unknown substanceas an acid or base?1.2.3.4.5.6.7.8.9.Gather materialsGoggles onClean off trayTear red litmus into three pieces and put into trayRepeat with blue and pH paperDrop unknown chemical (A) onto red, blue, and pH paperRepeat with unknown (B) and (C) liquids.Record observationsClean up

Conclusion Statement: Following the actualperformance of the lab, write a one paragraphsummary about What you did in this lab. How you performed this lab (a summary) What you learned as a result of performing this lab.

A formally typed or very neatly handwrittenlab (ON A SEPARATE PAPER!) is due!Turn in by Thurs. December 11th

It must include the following (40 points total possible): (LABEL EACH SECTIONWITH THE APPROPRIATE TITLE) Title of the lab (2 points) Problem: describe the problem that will be solved in this lab (2 points) Background information: one paragraph with facts about acids and bases (5points) Safety warnings: bulleted list of safety rules to be followed (5 points) Materials list: bulleted list of all materials needed for the lab (2 points) Procedures: step by step instructions (2 points) Data: Include your table and FILL IN THE RESULTS you collected when youtested the materials (10 points) Conclusion: A one paragraph summary of what you did, how you did it, andwhat you learned. (10 points) Spelling, grammar, and overall neatness will be graded as well (2 points)

Use the Rubric!

Nov 06, 2017 · Acids and Bases Acids and bases are special classes of compounds that exhibit common chemical properties. Acids and Bases . Organize a chart to put the data into. Sample A Sample B Sample C. Writing a