Homework Sourse1 How would you prepare 50 mL of solution that is 2mgmL NaCl
1.) How would you prepare 50 mL of solution that is 2mg/mL NaCl?
2.) How would you prepare 10 L of 0.3 M KH2PO4?
3.) How would you prepare 500 mL of a 5% (w/v) solution of NaCl?
4.) How would you prepare 100 mL of a 10% (v/v) solution of ethanol in water?
5.) How would you prepare 500 g of a 5% NaCl
solution by weight (w/w)?
8.) How would you prepare 10 mL of a 1/10 dilution of blood?
9.) How would you prepare 250 mL of a 1/300 dilution of blood?
10.) You have a recipe that calls for 1 part of salt solution to 3 parts of water. How would you mix 10mL of this solution?
11.) Convert 3 ppm to milligrams per liter and then convert it to milligrams per milliliter.
12.) How would you prepare 1L of solution that has 100 ppm fructose in water?
8.) How would you prepare 10 mL of a 1/10 dilution of blood?
9.) How would you prepare 250 mL of a 1/300 dilution of blood?
10.) You have a recipe that calls for 1 part of salt solution to 3 parts of water. How would you mix 10mL of this solution?
11.) Convert 3 ppm to milligrams per liter and then convert it to milligrams per milliliter.
12.) How would you prepare 1L of solution that has 100 ppm fructose in water?
7. A solution contains 10 g salt/L. obtain 1 mL of solution How could this solution be diluted in series to with a salt concentration of0.100 mg/L? Note: The undiluted solution is expressed in g L the diluted solution is m and (a) Determine the dilution factor for each: (2) 0.1 mL of first dilution 9.9 ml of water, dilution t to a final value of o 10o mg/L? Solution
1.) How would you prepare 50 mL of solution that is 2mg/mL NaCl?
Answer:
100 mg of NaCl dissolved in 50mL of H2O gives 2mg/mL NaCl
2.) How would you prepare 10 L of 0.3 M KH2PO4?
Molecular weight of KH2PO4 136.086
Grams to weigh = desired volume x desired molarity x Molar mass
= 10 L x 0.3M x 136.086
=408.2 g
Dissolve 408.2 g of KH2PO4 in 10 L of H2O
3.) How would you prepare 500 mL of a 5% (w/v) solution of NaCl?
5% (w/v) is 5g in 100 mL of H2O
25g NaCl in total of 500 mL H2O gives 5% (w/v) solution of NaCl
4.) How would you prepare 100 mL of a 10% (v/v) solution of ethanol in water?
10mL ethanol + 90 mL of H2O
