A manufacturer has 600 litres of a 12% solution of acid. How many litres of a 30% acid solution must be added to it so that acid content in the resulting mixture will be more than 15% but less than 18%?

How many litres of water will have to be added to 1125 litres of the 45% solution of acid so that the resulting mixture will contain more than 25% but less than 30% acid content?

A 0.1 M solution of a weak acid HA is 1% dissociated. The approximate value of dissociation constant is :

0.2 molar solution of formic acid is ionized to 3.2 %. Its ionisation constant is :

A solution of 8% boric acid is to be diluted by adding a 2% boric acid solution to it. The resulting mixture is to be more than 4% but less than 6% boric acid. If we have 640 litres of the 8% solution, how many litres of the 2% solution will have to be added?

How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

When a 0.1 M solution of an acid at room temperature has degree of ionisation of 10%, the concentration of hydroxyl ions is :

The pH of an aqueous solution of a 0.1 M solution of a weak monoprotic acid which is 1% ionised is :