Some Basic Conc...

In what ratio should a 15% solution of acetic acid be mixed with a 3% solution of the acid to prepare a 10% solution?

A 1.24 M aqueous solution of KI has density of $$1.15 g / cm^{3}$$ . What is the percentage composition of solute in the solution?

When a certain quantity of oxygen was ozonised in suitable apparatus, the volume decreased by $$4\ ml$$. On addition of turpentine the volume further decreased by $$8\ ml$$. All volumes were measured at the same temperature and pressure. From these data, establish the formula of ozone.

$$15\; g$$ of methyl alcohol is present in $$100$$ ml of solution. If density of solution is $$0.90$$ g/ml. Calculate the mass percentage of methyl alcohol in solution.

10 ml mixture of $$CO, CH_{4}$$ and $$N_{2}$$, exploded with an excess of oxygen, gave a contraction of 6.5 ml. There was a further contraction of 7ml when the residual gas was treated with $$KOH$$. Volume of $$CO, CH_{4}$$ and $$N_{2}$$ respectively, is :

20 ml of a mixture of $$C_{2}H_{2}$$ and CO was exploded with 30ml of oxygen. The gases after the reaction had a volume of 34ml. On treatement with $$KOH$$, 8ml of oxygen remained. Calculate the composition of the mixture.

$$300$$ g of an aqueous solution of a particular solute (containing $$30$$% solute by mass) is mixed with $$400$$ g of another aqueous solution of the same solute (containing $$40$$% solute by mass). In the final solution, mass $$\%$$ of solute is :

60ml of a mixture of nitrous oxide and nitric oxide was exploded with excess of hydrogen. If 38ml of $$N_{2}$$ was formed, calculate the volume of each gas in the mixture.

$$4.9$$ g sample of $$ KClO_{3}$$ was heated under such conditions that a part of it decomposed according to the equation: $$2KClO_{3}\rightarrow 2KCl+3O_{2}$$ and remaining underwent change according to the equation: $$4KClO_{3}\rightarrow 3KClO_{4}+KCl$$. If the amount of $$O_{2}$$ evolved was $$672$$ mL at $$1$$ atm and $$273$$ K, the percentage by weight of $$KClO_{4}$$ in the residue is :