DP Chemistry (last assessment 2024)
Question 18N.1.hl.TZ0.27
| Date | November 2018 | Marks available | [Maximum mark: 1] | Reference code | 18N.1.hl.TZ0.27 |
| Level | hl | Paper | 1 | Time zone | TZ0 |
| Command term | Question number | 27 | Adapted from | N/A |
27.
[Maximum mark: 1]
18N.1.hl.TZ0.27
An indicator, HIn, has a pKa of 5.1.
HIn (aq) H+ (aq) + In− (aq)
colour A colour B
Which statement is correct?
A. At pH = 7, colour B would be observed
B. At pH = 3, colour B would be observed
C. At pH = 7, [HIn] = [In−]
D. At pH = 3, [HIn] < [In−]
[1]
Markscheme
A