topic 5: Moles, Solutions and Acids

Question 1

Equation for “n” in terms of mad and molar mass.

Answer 1

n=m/M

Question 2

Equation for “n” in terms of volume of a gas and the molar volume of gas.

Answer 2

n=V gas/24

Question 3

Equation for “n” in terms of concentration and volume of solution.

Answer 3

n=c*V solution

Question 4

What is the equation for “number of particles”?

Answer 4

moles * Avogadro’s constant

Question 5

What equipment do you need for a titration?

Answer 5

Burette
Conical flask
Clamp stand

Question 6

What is the main objective of a titration?

Answer 6

To find the concentration of a sample solution.

Question 7

What do you need to complete the calculations for a titrations?

Answer 7

Balanced symbol equation for the reaction
Concentration of titrant
Volume of titre
Volume of sample solution

Question 8

What is another way of defining Acids to do with ions?

Answer 8

Acids can be defined as H+ donors or proton donors.

Question 9

What is another way of defining Bases to do with ions?

Answer 9

Bases can be defined as H+ acceptors.

Question 10

What are alkalis?

Answer 10

Bases that dissolve in water to produce OH- ions.

Question 11

Describe the colour change of methyl orange.

Answer 11

red in acid

yellow in alkali

Question 12

Describe the colour change of phenolphthalein.

Answer 12

colourless in acid

red in alkali