Isotonic saline is often given to patients intravenously to replenish lost fluids. Isotonic saline is a 0.9g/100ml solution of salty water. You are asked to make up 2:1 of isotonic saline. How much salt should you weigh out?
To determine how much salt you should weigh out to make 2:1 isotonic saline, you need to understand the ratio and the concentration of the solution.
In a 0.9g/100ml solution of isotonic saline, the concentration is given as 0.9g per 100ml of water. This means that for every 100ml of solution, there should be 0.9g of salt.
Now, let's determine the amount of salt needed for a 2:1 isotonic saline solution. The ratio 2:1 means that for every 2 parts of saline, there should be 1 part of salt.
To set up the equation, let's assume we want to make 200ml of saline solution (2 parts). With a 2:1 ratio, we need to find the amount of salt for 1 part, which is 100ml.
Since the concentration of isotonic saline is 0.9g/100ml, the amount of salt for 100ml of solution is 0.9g.
Therefore, if we want to make 200ml of isotonic saline (2 parts), we multiply the amount of salt needed for 100ml by 2.
0.9g/100ml x 2 = 1.8g of salt
So, to make up 2:1 isotonic saline of 200ml, you should weigh out 1.8g of salt.