How do i calculate this?
5 ml of 0.1% (w/v) AgNO3
2 L of 1% (w/v) NaCl
% by weight (w/v) is 100g/100mL. so 0.01% means 10g/100mL or 100g/1L.
am not sure what the question is asking!!!
To calculate the quantities of substances, such as AgNO3 and NaCl, you can use the formula:
Mass = Volume × Concentration
For the first calculation:
1. Convert the concentration of AgNO3 from percentage (w/v) to grams per milliliter (g/mL):
- 0.1% (w/v) means 0.1 grams of AgNO3 in 100 mL of solution.
- 0.1 grams / 100 mL = 0.001 grams/mL
This means the concentration of AgNO3 is 0.001 g/mL.
2. Multiply the concentration of AgNO3 by the volume required (5 mL):
- Mass = 0.001 g/mL × 5 mL = 0.005 grams
So, you need 0.005 grams of AgNO3 for a 5 mL solution.
For the second calculation:
1. Convert the concentration of NaCl from percentage (w/v) to grams per milliliter (g/mL):
- 1% (w/v) means 1 gram of NaCl in 100 mL of solution.
- 1 gram / 100 mL = 0.01 grams/mL
This means the concentration of NaCl is 0.01 g/mL.
2. Multiply the concentration of NaCl by the volume required (2 L):
- Mass = 0.01 g/mL × 2000 mL = 20 grams
So, you need 20 grams of NaCl for a 2 L solution.