Acids And Bases

Question 1

Name 5 characteristics of acids

Answer 1

Ph level bellow seven, sour, conducts electric, corrosive. Eg. Hydrochloride

Question 2

Name five characteristics of bases

Answer 2

Soapy and bitter, PH above seven, conduct electricity, corrosive and eg baking soda

Question 3

Define the term indicator

Answer 3

An indicator is a substance that changes colour to tell if a substance is an acid or a base

Question 4

What is universal indicator

Answer 4

Universal indicator shows by a colour change the PH level of a substance

Question 5

What was my hypothesis of my experiment

Answer 5

Coke is an acid washing up liquid gauscan and lemon juice are acids I think. Washer is national natural. I predict that milk is a base

Question 6

What is my independent variable from my experiment?

Answer 6

The household substance

Question 7

What is the dependent variable for my experience?

Answer 7

PH level

Question 8

What is a control variable for my experiment?

Answer 8

Same equipment, e.g. fashion tiles plus litmus paper and universal paper, same volumes same temperatures.

Question 9

What were the steeps for my titration experiment

Answer 9

1. During the titration slowly add the HCI to the NaOHconstantly swirling the flask to make the contents.
2. When the indicator changes from yellow to pink, you’ve reached the endpoint i.e. how much acid is needed to neutralise the base.
3. Repeat to get an average.
4. Without the indicator adding the average titration volume of HCI.
5. Poor the conical flask contents into an evaporating dish then use a hot dish evaporating of all the water

Question 10

Name 3 examples of everyday acids

Answer 10

Lemon juice
Rain water
Vinegar

Question 11

Name 2 laboratory acids

Answer 11

Hydrochloric acid
Sulfuric acid

Question 12

Name 3 everyday bases

Answer 12

Toothpaste
Bleach
Indigestion tablets

Question 13

List 3 laboratory bases

Answer 13

Sodium hydroxide
Calcium carbonate
Limewater

Question 14

What is the PH scale

Answer 14

In order to compare the strengths of acids and bases, chemists devised a scale called the pH scale. The scale is from 0 to 14.

Question 15

What is a neutralisation

Answer 15

The answer is they react together and neutralise, or cancel, each other. They react to produce a salt and water.

Question 16

How do we test for hydrogen

Answer 16

To confirm the bubbles of gas produced are hydrogen, place a lighted splint into the test tube.

Question 17

What os produced when acids react with substances

Answer 17

Salt