Question

1. Convert a 0.1 M NaCl to a % (w/v). 2. Convert 5% (w/v) sucrose to a Molarity (M). 3. Which solution was more concentrated, the 0.1 M NaCl or 5% (w/v) sucrose? 4. How could you make a dilute solution (ex. 0.5% (w/v) sucrose) more concentrated (without adding more sucrose)?

Answer #1

You have 47.0 mL of a 0.500 M stock solution that must be
diluted to 0.100 m. Assuming the volumes are additive, How much
water should you add?
(a) 1.How many grams of CaCl2 are needed to make 866.0 g of a
solution that is 39.0% (m/m) calcium chloride in water? Note that
mass is not technically the same thing as weight, but (m/m) has the
same meaning as (w/w).
(a)2. How many grams of water are needed to make...

1. For each of the following, explain whether the substances can
form a solution or not.
A. NH3 and NaCl CH4
B. KBr C4H10
C. CO2
2. Classify the following compounds as strong electrolytes, weak
electrolytes or non-electrolytes based on their dissolution
reactions in water.
A. C6H12O6(s)→C6H12O6(aq)
B. Na3PO4(s)→3 Na(aq)+PO43(aq)
C. AgCl(s)↔Ag+(aq)+Cl+(aq)
D. Mg(NO3)2(s)→Mg2+(aq)+2 NO3-(aq)
3. Write the balanced total ionic equation and net ionic
equation for the reaction that occurs when and (NH4)2CO3(aq) and
MgSO4(aq) are mixed.
4. What...

1. How to make 20ml of 3M NaCl?
2. What is the percent concentration of 3M NaCl?
3. What is the molar concentration of 10% NaCl?
4. Your stock solution is 5M NaCl and your goal is to make 25ml
of 0.5M NaCl (all in water). What volume of stock should you
use?
5. Make a reagent solution for enzymatic digestion of plasmid in
water.
The reaction conditions
require:
2x digestion
buffer
0.5% bovine serum albumin
10 mM sodium
chloride...

4. Given v= < -3, 2 > and w = < 5, - 4 >, find:
a) v + w
b) 3v – w
c) | v | =
d) The angle between v and w:

5.
Perform the following operations on the vectors u=(-4, 0, 2),
v=(-1, -5, -4), and w=(0, 3, 4)
u*w=
(u*v)u=
((w*w)u)*u=
u*v+v*w=

2. RDRPkill has a molecular weight of 400. You have a small,
concentrated 500 mM stock solution. a. Express this concentration
in the following units:
i. M
ii. μg/μL
iii. % (w/v)
iv. weight/dL
b. How much of this compound would you have to weigh out if you
were to make up 500 µL of the solution?
c. If you added 5 μL of a 500 mM solution to a cell incubation
with a total volume of 2 mL i....

1. You need 50 g of CuSO4 * H2O (FW 178), but only the anhydrous
form is available. how much of the anhydrous form is equivalent to
the 50g of monohydrate?
2. You need 100 mL of 10% (W/V) CuSO4 (FW 160), but only CuSO4 *
H2O is available.
3. Convert 2M NaCl (FW 58) to % (W/V).
4. What is the molarity of a 6.5% W/V NaOH (FW 40)?
5. A procedure requires the use of a 10% (W/V)...

1. If I have 100 mL of a 0.15 M NaOH solution and I dilute the
solution to a final volume of 250 mL, what will the molarity of the
diluted solution be?
2. If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution,
what will the molarity of the diluted solution be?
3. I have 345 mL of a 1.5 M NaCl solution. If I boil the water
until the volume of the...

Let u = (−3, 2, 1, 0), v = (4, 7, −3, 2), w = (5, −2, 8, 1).
Find the vector x that satisfies 2u − ||v||v = 3(w − 2x).

1.) Indicate which aqueous solution has the lowest vapor
pressure:
a. 0.2 M MgCl2 b. 0.1 M
MgCl2 c. 0.2 M NaCl d. 0.1
M KCl e. 0.1 M Na2CO3
2.) Indicate which aqueous solution has the fastest evaporation
rate.
a. 0.2 M MgCl2 b. 0.1 M
MgCl2 c. 0.2 M NaCl d. 0.1
M KCl e. 0.1 M Na2CO3
3.) What is the molarity of a sucrose
(C12H22O11) solution that produces
an osmotic pressure of 2.65 atm at 25°C?...

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