DP Chemistry (first assessment 2025)

Test builder »

Question 23M.2.SL.TZ2.2a

Select a Test
Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.SL.TZ2.2a
Level SL Paper 2 Time zone TZ2
Command term Outline, State Question number a Adapted from N/A
a.
[Maximum mark: 2]
23M.2.SL.TZ2.2a
(a)

All species are almost colourless except for MnO4−, which has an intense purple colour, though the kale extract is coloured by the chlorophyll present.

(a.i)

State the colour change at the end point.

 

From:  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 


To:   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

[1]

Markscheme

green to purple
OR
green to brown
OR
green to purple-green ✓

 

Accept “colourless to purple”.
Accept “green to grey/blueish”.
Do not accept “clear” for “colourless”.
Do not accept “purple to “brown”.
Do not accept blue as final colour.

(a.ii)

Outline how the addition of distilled water to the 10.0 cm3 aliquot before titration will affect the titrant volume at the end point.

[1]

Markscheme

none / no effect ✓