30
40
20
50
Correct answer is B
To make a fixed amount of a dilute solution from a stock solution,
use the formula: C1V1 = C2V2
where: V1 = Volume of stock solution needed to make the new solution.
C1 = Concentration of stock solution.
V2 = Final volume of new solution.
C2 = Final concentration of stock solution
2 * 10 = 0.5 * V2
20 = 0.5V2
200.5 = V2
= 40dm3
Consider the following reaction equation: CuO(s) + H2(g) → Cu(s) + H2O(1) Which substance ...
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as ...
Trioxonitrate (V) acid is not used for preparing hydrogen gas from metals because it ...
What is the atomic number of Cobalt? ...
Iron galvanized with zinc is cathodically protected from corrosion. This is because? ...
Which of the following bonds are broken when ethanol is boiled? I. Covalent bonds II. Ionic bond...
It is difficult to achieve an orderly arrangement of the molecules of a gas because they? ...
Which of the following compounds will form a solution if exposed to air? ...
When concentrated H2 SO 4 is added to NaCI (s), the gas evolved...