+91-9828-747676
Question
The waste water of a certain large colony contains 10–5.6 mmol/l of OH– ions at 25°C. The pH of this sample is 
A.
8.6
B.
7.9
C.
5.4
D.
4.5
Answer ( Option C)

5.4

Solution

Concentration of OH– ion = 10–5.6 mmol/litre
= 10–5.6 × 10–3 mol/litre
= 10–8.6 mol/litre
pOH = – log[OH–]
= – log 10–8.6 
= 8.6
pH = 14 – pOH
= 14 – 8.6
= 5.4

Popular Online Test Serie

Preparing students for success in a changing World.

RPSC-AE

RPSC-AE
RSSB-JE

RSSB-JE
SSC-JE

SSC-JE
RRB-JE/SSE

RRB-JE/SSE
RSEB-JE/AE

RSEB-JE/AE
DRDO CEPTAM -10 (STA-B)

DRDO CEPTAM -10 (STA-B)

ISRO Scientist Engineer

ISRO Scientist Engineer
View All

Online Classes

We care about our students

View More


banner
banner
banner
banner
banner
Online Classes
Register Now
Test Series
Register Now
Job Notification
Job Notification

Daily Quiz

RPSC-AE, RSMSSB-JE, SSC-JE, RRB-JE, PSU's