Nitric acid is a strong acid

Because its molecules completely disassociate in water into ions, which gives its aqueous solutions the ability to conduct electricity efficiently

Acetic acid is a weak acid

Because some of its molecules disassociate in water into ions, which makes its aqueous solutions weak conductors of electricity.

Ethyl alcohol is nonelectrolyte

Because its molecules doesn't disassociate in water into ions and cannot conduct electricity.

Some acids such as carbonic acid have two types of salts

Because their molecules structure contain two hydrogen atoms (dibasic acids)

PH of ammonium chloride solution is less than 7

Because it has an acidic effect, as its formed from an anion of strong acid (chloride negative ion) and a cation of weak base (ammonium positive ion)

PH of sodium carbonate solution is more than 7

Because it has a basic effect, as it's formed from an anion of weak acid and a cation of strong base

PH of acetic acid equals 7

Because the strengths of the acid anion and base cation are equal

Choose the correct answer

1- Phosphoric acid H3PO4 is ……. acid

A- Monobasic B- Dibasic C- Tribasic B-Multibasic

2- The pH of an acidic solution is…..

A- 7 B- 5.5 C- 8.5 D-14

3- When ammonia reacts with hydrochloric acid, ammonium ion NH4+ is…

A- Conjuagte acid B- acid C- Base D- Conjugate base

Is a strong acid

A- Acetic acid B- Carbonic acid C- Nitric acid D- Citric acid

5- The colour of phenolphthalein changes to fuchsia in a solution of ….. pH

A- 2 B-4 C-6 D-9

Write the scientific term

1- A substance that contains hydrogen and gives it away when reaction with metals

2- A chemical substance whose colour change by the change of the solution

3- A method for determining the type of solution in numerical values ranging from 0 to 14

4- A substance that has the ability to accept protons

5- A substance that gives away protons

Answer the following questions

1- Compare between the definitions of acid and bases in The Arrhenius, Bronsted-Lowry and Lewis theories (with giving examples and chemical reactions)

2- Determine the basic cations and the acidic anions of the following salts:-

A- Potassium nitrate

B- Sodium acetate

C- Ammonium phosphate

D- Copper sulphate

The Answers

Choose

1- Tribasic

2- 5.5

3- Conjugate base

Ammonia (A Bronsted-Lowry base) reacts with hydrochloric acid (Bronsted-Lowry acid) forming ammonium ion (A conjugate acid because it gains a proton

4- Nitric acid

5- 9 (Base)

Write the scientific term

1- Acid

2- Indicator

3- pH

4- Bronsted-Lowry base

5- Bronsted-Lowry acid

Answer the following questions

1- Page 21

2-

Basic cation	Acidic anion	Salt
K+	NO3 -	Potassium nitrate KNO3
Na+	CH3 COO-	Sodium acetate CH3COONa
NH4 -	PO4 +3	Ammonium phosphate (NH4)3 PO4
Cu ++	SO4 --	Copper sulphate CuSO4

Дата добавления: 2015-10-23