To prepare a solution of 10%, 20%, or 30% phosphoric acid from a concentrated solution, you will need to know the concentration of the concentrated solution. Let's assume the concentrated solution has a concentration of 100%.
To calculate the amount of concentrated solution and the amount of water needed to prepare a specific percentage, you can use the formula:
(V1 * C1 = V2 * C2)
Where:
V1 = Volume of concentrated solution
C1 = Concentration of concentrated solution
V2 = Total desired volume of the solution
C2 = Desired concentration of the solution
Let's break down the steps to prepare each percentage:
1. 10% Phosphoric Acid:
To prepare 10% of phosphoric acid in a 250ml volume, we can set up the equation as follows:
(V1 * 100% = 250ml * 10%)
We know that 10% is equal to 10% phosphoric acid and 90% water.
So, the equation becomes:
(V1 * 100% = 250ml * 10%)
(V1 = (250ml * 10%)/100%)
Solving this equation will give you the volume of the concentrated solution, which is needed to prepare the desired concentration.
2. 20% Phosphoric Acid:
To prepare 20% of phosphoric acid in a 250ml volume, we can use the same formula as before:
(V1 * 100% = 250ml * 20%)
(V1 = (250ml * 20%)/100%)
Solving this equation will give you the volume of the concentrated solution, which is needed to prepare the desired concentration.
3. 30% Phosphoric Acid:
To prepare 30% of phosphoric acid in a 250ml volume, we can again use the same formula:
(V1 * 100% = 250ml * 30%)
(V1 = (250ml * 30%)/100%)
Solving this equation will give you the volume of the concentrated solution, which is needed to prepare the desired concentration.
By using these calculations, you can determine the required volume of the concentrated solution and the amount of water to prepare 10%, 20%, or 30% phosphoric acid in a 250ml volume.