Question

You wish to prepare **185** grams of
**3.43** % **KF**.

You will need ? grams of **potassium fluoride** and ?
mL of water.

Assume that the density of water is 1.00 g / ml.

Answer #1

A. You wish to prepare 198 grams of 10.3 %
Na3PO4. How many grams will need of sodium
phosphate and how many mL of water? Assume that the density of
water is 1.00 g / ml.
B. If 20.5 grams of an aqueous solution of cobalt(II) sulfate,
CoSO4, contains 2.84 grams of cobalt(II) sulfate, what
is the percentage by mass of cobalt(II) sulfate in the
solution?
C. An aqueous solution of lead nitrate,
Pb(NO3)2, contains 8.74 grams of lead nitrate...

The addition of 109 g potassium fluoride to 597 mL of water (d =
1.00 g/mL) causes the temperature to rise 3.10 °C. What is the
ΔHsoln for KF?

A) How many grams of solid silver nitrate would you need to
prepare 150.0 mL of a 0.140 M AgNO3 solution? B) An experiment
calls for you to use 100 mL of 0.30 M HNO3 solution. All you have
available is a bottle of 3.8 M HNO3. How many milliliters of the
3.8 M HNO3 solution do you need to prepare the desired solution? C)
How many milliliters of water do you need to prepare the desired
solution?

How many grams of methanol (CH3OH) would need to be combusted to
raise the temperature of 25.0 L of water by 2.25 °C, given the
information below? The specific heat of water is 4.18 J/g⋅°C.
Assume the density of water is 1.000 g/mL.
2CH3OH(l) + 3O2(g) = 2CO2(g) + 4H2O(l)
∆H° = –1452.8 kJ

You need to prepare 200 mL of 1.00 M NaOH from solid NaOH and
water. you also need to prepare 200 mL of 6.00 M HCl from
concentrated HCl solution.
Describe how you would prepare the NaOH and the HCl solutions.
You need to show th data and calculations for the
standardization.

How many grams of solid silver nitrate would you need to prepare
250.0mL of a 0.200M AgNO3 solution? Express your answer
using three significant figures.
An experiment calls for you to use 100 mL of 0.30M HNO3
solution. All you have available is a bottle of 4.3M HNO3. How many
milliliters of the 4.3M HNO3 solution do you need to prepare the
desired solution?Express your answer using two significant
figures.
How many milliliters of water do you need to prepare...

Potassium metal and water react to form potassium hydroxide and
hydrogen gas. If you react 1.12g of potassium metal and 15.0mL of
water (density=.99997 g/mL) which reactant is the limiting? how
many grams of potassium hydroxide are formed?how many grams of
potassium metal remain? how many grams of water remain? (Hint:
balenced equation)

How many grams of potassium iodide would you need to make 250 mL
of a 0.624 M solution of potassium iodide?

You wish to prepare 50.0 mL of 2.30 x 10-2 M solution
of Cipro (C17H18FN3O3).
Describe how to prepare this solution from the pure drug and
deonized water. Volumetric flasks and analytical balances are
available to use.
The molecular weight of Cipro is 331.4 g

Which of the following methods could you use to prepare 1.00 L
of 0.225 M HI?
Place 28.8 g of HI in a 1.00-L volumetric flask and then add
enough water to make 1.00 L of solution
.Measure out 37.5 mL of 6.00 M HI and dilute with enough water
to prepare 1.00 L of solution.
Dilute 75.0 mL of 3.00 M HI with 925.0 ml of water.
Combine 28.8 g of HI with 1.00 L water.
Mix 37.5 mL...

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