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Acids and Bases

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by

Cassandra Schmidt

on 18 November 2013

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Transcript of Acids and Bases

Base
(W) a base is a substance that tastes bitter, feels slippery, and turns red litmus paper blue.

Bases are often called the "opposite" of acids.
Acid
Virtual pH mini LAB
What are acids? Discuss what you already know about acids with a partner.
pH scale
(W) an acid is a substance that tastes sour, reacts with metals and carbonates, and turns blue litmus paper red.

(W) More properties of Acids:
Contains hydrogen ions (H+) when dissolved in water
Has a pH less than 7
To determine the difference between Acids & Bases
Our Goals for today
(W) The pH scale measures how acidic or basic a solution is.
What is the pH scale?
What are bases? Discuss....
Examples:
Hydrochloric acid (HCl)
Sulphuric acid (H2SO4)
Nitric acid (HNO3)
Carbonic acid in soft drink (H2CO3)
Ascorbic acid (Vitamin C) in fruit
Citric acid in oranges and lemons
Acetic acid in vinegar
Tannic acid (in tea, grapes and wine)
Examples of Bases:
Blood
Antacid
Baking soda
Ammonia
Egg whites
laundry detergent
How can we tell if a substance is an acid or a base?
Lower pH value indicates a stronger acid.
Higher pH value indicates a stronger base.
(W) the pH scale is a range of values from 0 to 14. It expresses the concentration of hydrogen ions in a solution.
(W) Acids have a pH from 0-7
(W) Bases have a pH from 7-14
What happens when the pH of a substance is 7?
Did we Miss something??
(W) A pH level of 7 indicates a Neutral Substance i.e: Water!
A Base is characterized by:

A bitter taste. (Milk of Magnesia)

It feels slippery. (Soapy Water)

It turns Red Litmus Blue.
Characteristics of Bases
Google: "Glencoe virtual pH lab", select the first link that pops up (Virtual Lab - Glencoe)
On a piece of paper, number 1-6
Label each number with the name of the solution (everyone will have a different set of solutions)
Use the pH paper to determine the pH of each solution, enter it into the lab program, and then record it onto your paper.
Once you have all 6 complete, click the "check" button to check yourself.
Turn in your paper.
If time, click "reset" and do another set of 6 solutions.
http://www.glencoe.com/sites/common_assets/science/virtual_labs/E22/E22.html
Brain Pop: Acids and Bases
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