How many grams of each substance are needed to prepare th e following solutions?
50.0 ml of 8.0%(w/v)KCL
To calculate the number of grams of KCl needed to prepare a 50.0 ml solution of 8.0%(w/v) KCl, we need to use the formula:
Mass of solute(g) = Volume of solution (ml) × Concentration of solute(w/v)
Given that the volume of solution is 50.0 ml and the concentration of KCl is 8.0%(w/v), we can now calculate the mass of KCl needed.
Mass of KCl (g) = 50.0 ml × 8.0 g/100 ml = 4.0 g
Therefore, you will need 4.0 grams of KCl to prepare a 50.0 ml solution of 8.0%(w/v) KCl.
To determine the number of grams of KCl needed to prepare a 50.0 ml solution of 8.0% (w/v) KCl, we can use the formula:
Mass (in grams) = Volume (in ml) × Concentration (in %) / 100
Step 1: Convert the volume from ml to liters:
50.0 ml = 50.0 / 1000 = 0.050 L (since there are 1000 ml in 1 L)
Step 2: Calculate the mass of KCl:
Mass (in grams) = 0.050 L × 8.0% / 100 = 0.004 grams
Therefore, to prepare a solution of 50.0 ml of 8.0% (w/v) KCl, you would need approximately 0.004 grams of KCl.