ON Name: Group: Section: Bio 1210z: Lab 7 Date: Pre-lab assignment Complete the
ID: 199679 • Letter: O
Question
ON Name: Group: Section: Bio 1210z: Lab 7 Date: Pre-lab assignment Complete the items below before coming to lab I. List one advantage to measuring solution concentrations using percentages. List one advantage to using molarity 2. Calculate the following, showing your work How many grams of sucrose (molecular weight = 342 ginol) do you need to prepare 100 mL of 5% sucrose? a. b. How many grams of sodium chloride (Sa5fmo) do you need to prepare 100 ml of S% Naci c. How many grams of sodium chloride(58.Simo) do you need to prepare SOO mL of 10% NaCl 3. Calculate the following, showing your work a. How many grams of sucrose (042 g/mol) do you noed to make 100 ml of a I M solution? b. How many grams of sodium chloride (585 g/mol) do you need to make I L of a 25 mM (25 millimolar 0.025 M) solution 4. Calculate the following, showing your work How many milliliters of a 2 M NaCI stock solution do you need to prepare 100 mL of 0.2 M NaCI? How many milliliters of water do you need to add? a. How many milliliters of a 25% sucrose stock do you need to prepare 10 mL of a 5% sucrose solution? How many milliters of water do you need to add?Explanation / Answer
Answer:
1) List one advantage to measuring solution concentration using percentage %. List one advantage to using molarity.
2. Calculate the following:
a) How many grams of sucrose (MW = 342g/mol) do you need to prepare 100ml of 5% sucrose.
b) How many grams of sodium chloride (58.5 g/mol) do you need to prepare 100ml of 5% NaCl
c) How many grams of sodium chloride (58.5 g/mol) do you need to prepare 500ml of 10% NaCl?
3) Calculate the following
a) How many grams of sucrose (342 g/mol) do you need to make 100ml of a 1M solution?
b) How many grams of sodium chloride (58.5 g/mol) do you need to make 1L of a 25mM (0.025M) solution?
4) Calculate the following
a) How many milliliters of a 2M NaCl stock solution do you need to prepare 100ml of 0.2M NaCl? How many milliliters of water do you need to add?
b) How many milliliters of a 25% sucrose stock do you need to prepare 10ml of a 5% sucrose solution? How many milliliters of water do you need to add?
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