4 Acids and bases

Question 1

What is a base its groups and what ion does it have

Give examples of sub groups

Answer 1

Bases are split into insoluble bases like carbonates and oxides. Soluble bases are called alkalis and consist of hydroxides. These substances have a higher ph than 7 and the ion is OH-

Question 2

What is an acid and what ion does it contain

Give examples

Answer 2

A soluble substance in water that has a higher pH than 7. They are neutralised by bases and the ion is H+. Some acids are sulfuric,nitric and hydrochloric.

Question 3

What is neutilisation

Answer 3

When an acid and base react together to make a ph of 7 water

Question 4

Why is hydrochloric acid stronger than ethanoic acid even though HCl is dilute

Answer 4

This is because the ions in HCl full ionise making it more reactive and able to corrode more. Whilst in ethanoic acid or vinegar the ions havent full ionised

Question 5

What is titration

Answer 5

Finding the concentration of an unkown solution and how much acid is needed to neutralise an alkali

Question 6

Step by step

Titration

Answer 6

Measure out 25cm cubed of HCl into a measuring cylinder then into a conical flask
3-5 drops of indicator
Fill biurette with 0.1 mol/dm cubed of NaOH to 0.00cm cubed
Read from bottom of meniscus
Open swith and swirl Hcl until permanent colour change

Question 7

Titration equation when the mean of titration is 23.13
and the NaOH concentration is 0.1

Answer 7

Moles of (NaOH) lXv=0.1x(23.13/1000)=2.313x10 -3
1:1 ratio
Concentration of
(HCL)=n/v=2.313x 10 -3/25/1000=0.09252

Question 8

How to set up crystillisation