Sam prepares a solution of sodium chloride with a concentration of 8 g/dm³. if he only used 2g of sodium chloride, what volume of water did he dissolve it in, in cm³?

The volume of water for 2 g sodium chloride with concentration of has been .

Concentration has been defined as the mass of solute with respect to the solution. The concentration has been expressed in various ways such as density, molarity, molality, etc.

The concentration of given solution has been . It has been stating that 8 gram of sample has been present in 1 cubic decimeter solution.

The volume of water has been obtained for 2 gram of sodium chloride solution as:

The volume of water for 2 g of solution has been 0.25 cubic decimeter.

The decimeter cube has been given as in terms of cubic centimeter as:

The volume of water for 2 g sodium chloride with concentration of has been .

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The volume of water he dissolved the solute is 250 cubic centimeter.

Explanation:

            Concentration = mass of solute in g / volume in dm^3

The concentration of a solution is defined as the ratio of mass of solute in grams to the volume of water in dm^3.

If concentration of a solution = 8 g/dm^3.

mass of solute =2 g.

Volume of a water = 2 / 8 = 0.25 dm^3. (or) 250 cubic centimeter.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

a