A chemist has 10 litre of a solution that is 10% sulphuric acid by volume. He wants to dilute the solution to 4% strength by adding water how many litre of water must be added?
total volume is 10l, acid volume is 10lx10%=1l, volume of water to be added- xl, new strength is 4%=0.04
x=15 liters of water to be added
5 litres of HCL is added to 15 litre of a solution containing 40% of DI water.
What is the percentage of DI water in the new mixture?
A stockist wants to make some profit by selling rice.
He contemplates about various methods.
Which of the following would maximize his profit?
1. Sell rice at 10% profit.
2. Use 900 g of weight instead of 1 kg.
3. Mix 10% impurities in rice and selling rice at cost price.
4. Increase the price by 5% and reduce weights by 5%.