Cation 5

Question 1

Group V Cations is sometimes called the

Answer 1

soluble group

Question 2

True of False: Group 5 Cations don’t have a precipitate

Answer 2

True

Question 3

GROUP V CATIONS:

Answer 3

• Sodium (Na+) lon
• Potassium (K+) lon
• Ammonium NH4+ lon

Question 4

The salts of these cations, with few exceptions, are quite

Answer 4

soluble

Question 5

This accounts for the fact that there is no __________ agent for this group.

Answer 5

precipitating

Question 6

If a strong base such as _____________or _____________ is added to a solution containing ammonium ions and the solution is warmed, the escape of ammonia gas results.

Answer 6

KOH (Potassium hydroxide)
NaOH (Sodium hydroxide)

Question 7

Mag escape and ammonia gas if may ara sang

Answer 7

Strong bases

Question 8

The ammonia gas which escapes may be recognized by its ____ or by its action upon moist ________

Answer 8

odor
red litmus paper

Question 9

The most liable qualitative tests for sodium and potassium ions in low concentrations are their identifying

Answer 9

flame spectra

Question 10

confirms the presence of SODIUM IONS

Answer 10

INTENSE YELLOW FLAME persisting for several seconds

Question 11

presence of POTASSIUM IONS

Answer 11

PALE VIOLET FLAME

Question 12

TEST FOR SODIUM AND POTASSIUM IONS

Transfer one-half of the unknown sample to an evaporating dish and add

Answer 12

1 drop of concentrated HCI (Hydrochloric acid)

Question 13

What is used to clean the wire

Answer 13

Diluted HCL

Question 14

confirms the presence of SODIUM ION.

Answer 14

INTENSE YELLOW flame persisting for 5 seconds

Question 15

in the absence of sodium ions, presence of potassium ions imparts a ________ color to flame when viewed with the naked eye.

Answer 15

pale violet

Question 16

If yellow flame of sodium is present it will be necessary to view flame through a filter of _______.

Answer 16

cobalt glass

Question 17

confirms the presence of POTASSIUM ION.

Answer 17

REDDISH-VIOLET flame persisting for about 2 seconds

Question 18

In the test for Ammonium ion, Make solution alkaline with

Answer 18

3M KOH
(Potassium hydroxide)

Question 19

confirms the presence of AMMONIUM ION.

Answer 19

Even shading of litmus paper from red to blue

Question 20

Confirmation for Potassium ion:
FLAME TEST: (in Cobalt glass)

Answer 20

Lilac

Question 21

Confirmation for Potassium ion:
FLAME TEST: (w/o cobalt glass)

Answer 21

Pink

Question 22

Confirmation for Ammonium ion
Reagent used:

Answer 22

strong base (either NaOH or KOH)

Question 23

Used to upset the equilibrium forming ammonia gas

Answer 23

Strong bases such as NaOH or KOH