Chapter 15- Analysing water for Salts

Question 1

Quantative Analysis

Answer 1

How much of a substance is present

Question 2

Qualitative Analysis

Answer 2

What is present in a sample

Question 3

Electrical Conductivity

Answer 3

Salts are ionic they produce mobile ions. They can therefore conduct electricity.
Quick and inexpensive method

Question 4

Colorimetry

Answer 4

Colour levels are compared with a set of standards

Involves shining a light of complementary colout and measuring the amount absorbed.

Question 5

UV-Visible Spectroscopt

Answer 5

Absorption is related to concentration

• Light of a speicfic frequency is used
• Can be used for colourless and coloured substances.

Question 6

Atomic Absorptopin Spectroscopy

Answer 6

Prescence of metal ions

Question 7

Gravemtric Analysis

Answer 7

Analysis by weight, collecting and drying percipitates

Question 8

Prinicple of stoichiometry

Answer 8

Study of ratios of stances involved in chemical reaciton

Question 9

4 Steps in stoichiometric problems

Answer 9

1. Write a balanced equationfor the reaction indentifying known and unknown quantities of substances
2. Calculate the number of moles known to the substance
3. Find the mole ratio
4. Calculate the required quantity of the substance.