If 50ml of a 7.5% (w/v) sodium bicarbonate injection are added to 500ml of a5% dextrose injection , what is the percentage strength (w/v)of sodium bicarbonate in product?

0.68%

0.7

To determine the percentage strength (w/v) of sodium bicarbonate in the product, you need to calculate the total amount of sodium bicarbonate in the final solution and then express it as a percentage of the total volume of the solution.

First, you need to find out the amount of sodium bicarbonate in the 50ml of 7.5% (w/v) sodium bicarbonate injection. The term "7.5% (w/v)" implies that there are 7.5 grams of sodium bicarbonate in every 100 milliliters of the solution. So, you can calculate the amount of sodium bicarbonate in 50ml as follows:

Amount of sodium bicarbonate in 50ml = (7.5 grams/100 ml) x (50 ml) = 3.75 grams

Next, you need to add this amount of sodium bicarbonate to the 500ml of 5% dextrose injection. The term "5% (w/v)" indicates that there are 5 grams of the solute (in this case, dextrose) in every 100 milliliters of the solution. Since sodium bicarbonate is being added to this solution, the total volume becomes 550ml (50ml + 500ml).

To find the total amount of sodium bicarbonate in the final solution, you can sum up the amount in the original sodium bicarbonate injection (3.75 grams) with the amount added to the solution (0 grams):

Total amount of sodium bicarbonate in the final solution = 3.75 grams + 0 grams = 3.75 grams

Finally, you can express the percentage strength (w/v) of sodium bicarbonate in the product by dividing the total amount of sodium bicarbonate by the total volume of the solution (550ml) and multiplying by 100:

Percentage strength (w/v) of sodium bicarbonate in the product = (3.75 grams/550 ml) x 100 = 0.68% (approximately)

Therefore, the percentage strength (w/v) of sodium bicarbonate in the product is approximately 0.68%.