Chemical Analysis Unit 8

Question 1

In flame emission spectroscopy, each metal ion absorbs and gives out its own characteristic pattern of radiation. Name?

Answer 1

Line spectrum

Question 2

Uses of flame emission spectroscopy?

Answer 2

Discover new elements
Detect toxic metal ions in drinking water
Control amount of trace ions in alloys such as steel

Question 3

Explain how Flame Emission Spectroscopy works.

Answer 3

• Sample put into flame
• Light given out is passed through a spectroscope
• Output is a line spectrum

Question 4

What can you do with the line spectrum results?

Answer 4

Can identify it to the metal ion

Can measure the concentration of the metal ion

Question 5

Chemical and state symbol equation for Iron(II) reacting with sodium hydroxide? (Usually the cation is with a chloride)

Answer 5

FeCl2(aq) + 2NaOH(aq) —> 2NaCl(aq) + Fe(OH)2 (s)

Question 6

Chemical and state symbol equation for Iron(III) reacting with sodium hydroxide? (Usually the cation is with a chloride)

Answer 6

FeCl3(aq) + 3NaOH(aq) —> 3NaCl(aq) + Fe(OH)3 (s)

Question 7

Chemical and state symbol equation for Copper reacting with sodium hydroxide? (Usually the cation is with a chloride)

Answer 7

CuCl2(aq) + 2NaOH(aq) —> 2NaCl(aq) + Cu(OH)2 (s)

Question 8

HOW do you detect ions with FES?

Answer 8

Line spectrum result is matched with metal ion spectra

Question 9

Name an instrumental method

Answer 9

Flame emission spectroscopy

Question 10

With chromatography l, how can you increase reliability of answers?

Answer 10

Use different solvents

Calculate different R.f values to see if still match