I really don't understand these questions, I know it is not allowed to answer people's question, but I need help on how to answer these questions. I am failing chemistry lab, so I need to do good. That's why I am asking for help.
1) A medical laboratory scientist needs to prepare 500.0 mL of a solution that is 5.0 mM in K+ for diluting serum. What volume, in mL, of a 5.0% (m/v) KCI solution is required to make this solution?
2) How many mL of a 1.0% m/v stock solution are needed to prepare 50.0 mL of a 0.20% solution?
3) How many grams of Na2SO4 are contained per liter of a 0.500 M solution?
4) How many grams of MgCl2 are needed to prepare 750 mL of a 0.50 M solution?
5) A solution is prepared by dissolving 125g of Na3PO4 in enough water to make two liters of solution. Determine the concentration of this solution in units of : A) % m/v , B) molarity (i.e., mol/L) C. osmolarity (i.e., osm/L)
6) What is the molarity of a solution made by dissolving 25 g of NaCl in 750 mL of water?
7) How many grams of NaCl are needed to prepare 3.0 L of a 5.0 % m/v solution?
What is the concentration in % m/v of a solution prepared by dissolving 35 g of NaOH in enough water to make 2.5 L of solution?
9) A 15% m/v solution is prepared by diluting 50mL of a stock solution with water up to 125 mL of solution. What is the concentration of the stock solution in % m/v?
10. If a patient has a fasting blood sugar of 76 mg/dL, what is his blood sugar in mmol/L?
11: What is the osmolarity of a 2.2 M solution of MgCl2?
12: What is the molarity of a 0.25 Osm solution of NaCl?
13: What is the concentration in % m/v of a 2.0 M NaOH solution?