For the next question, click on the Next Question button.

Question 1 of 3

How many millilitres of Ethanol (96 per cent) BP 1988 do you need to prepare 250 ml of 35 % Ethanol? Answer to 1 decimal place.

Type in your answer and PRESS ENTER.

ml
You need 90.9 ml of Ethanol (96 per cent) BP.
Ethanol (96 per cent) BP contains 96.0 to 96.6 % Ethanol giving an average of 96.3 %.
Concentration1 x Quantity1 = Concentration2 x Quantity2
  96.3          x Quantity1 =            35          x    250
     Quantity1 =    8750    ml
96.3
Quantity1 = 90.86 ml
Quantity1 = 90.9 ml to 1 dec pl
Formula:
90.7 ml Ethanol (96 per cent) BP to      250 ml Water

No, that is not the correct answer.

Have another go: just type in your new answer and press Enter.
If you continue to have problems, have a look at the answer.

For the next question, click on the Next Question button.

Question 2 of 3

Calculate the amount in millilitres of Ethanol (96 per cent) BP 1988 needed to prepare 630 ml of 85 % Ethanol. Answer to 1 decimal place.

Type in your answer and PRESS ENTER.
ml
You need 556.1 ml of Ethanol (96 per cent) BP.
Ethanol (96 per cent) BP contains 96.0 to 96.6 % Ethanol giving an average of 96.3 %.
Concentration1 x Quantity1 = Concentration2 x Quantity2
  96.3          x Quantity1 =            85          x    630
       Quantity1 =    53550    ml
96.3
  Quantity1 = 556.07 ml
Quantity1 = 556.1 ml to 1 dec pl
Formula:
556.1 ml Ethanol (96 per cent) BP to      630 ml Water

No, that is not the correct answer.

Have another go: just type in your new answer and press Enter.
If you continue to have problems, have a look at the answer.

For the next question, click on the Next Question button.

Question 3 of 3

You need to prepare 1.125 litres of 55 % Ethanol. How many millilitres of Ethanol (96 per cent) BP 1988 do you need? Answer to 1 decimal place.

Type in your answer and PRESS ENTER.
ml
You need 642.5 ml of Ethanol (96 per cent) BP.
Ethanol (96 per cent) BP contains 96.0 to 96.6 % Ethanol giving an average of 96.3 %.
Concentration1 x Quantity1 = Concentration2 x Quantity2
  96.3            x Quantity1 =            55          x    1125
       Quantity1 =    61875    ml
96.3
  Quantity1 = 642.52 ml
Quantity1 = 642.5 ml to 1 dec pl
Formula:
642.5 ml Ethanol (96 per cent) BP to      1125 ml Water

No, that is not the correct answer.

Have another go: just type in your new answer and press Enter.
If you continue to have problems, have a look at the answer.