Chat with tutor

Ask Questions, Get Answers

Questions  >>  CBSE XII  >>  Chemistry  >>  Solutions

A 6.90 M solution of KOH in water contains 30% by mass of KOH.Calculate the density of the KOH solution ?[Molar mass of KOH=$56g mol^{-1}$]

$\begin{array}{1 1}1.288gcm^{-3}\\2.288gcm^{-3}\\3.288gcm^{-3}\\4.288gcm^{-3}\end{array} $

1 Answer

A 6.90M solution contains 6.90 mol KOH in 1000 $cm^3$ of the solution
Mass of 6.90 mol of KOH =$6.90\times 56$
$\Rightarrow 386.4g$
A 30% solution contains 30g of KOH present in 100g of solution.
$\therefore 386.4$ g of KOH is present in = $\large\frac{100\times 386.4}{30}$
$\Rightarrow 1288g$ of solution
Density of KOH solution =$\large\frac{\text{Mass}}{\text{Volume}}$
$\Rightarrow \large\frac{1288g}{1000cm^3}$
$\Rightarrow 1.288g cm^{-3}$
Help Clay6 to be free
Clay6 needs your help to survive. We have roughly 7 lakh students visiting us monthly. We want to keep our services free and improve with prompt help and advanced solutions by adding more teachers and infrastructure.

A small donation from you will help us reach that goal faster. Talk to your parents, teachers and school and spread the word about clay6. You can pay online or send a cheque.

Thanks for your support.
Please choose your payment mode to continue
Home Ask Homework Questions
Your payment for is successful.
Clay6 tutors use Telegram* chat app to help students with their questions and doubts.
Do you have the Telegram chat app installed?
Already installed Install now
*Telegram is a chat app like WhatsApp / Facebook Messenger / Skype.