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12 Nov 2019

What volume of the concentrated solution is required to prepare:

a. 500 mL of 2.0 M nitric acid from concentrated nitric acid (72%, 1.42 g/mL)?

b. 100 mL of 5.0 M sulfuric acid from concentrated sulfuric acid (96%, 1.84 g/mL)?

c. 1 liter of 6.0 M NH4OH from concentrated NH4OH (58%, 0.90 g/mL)?

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Concentrated sulfuric acid (18.4-molar H2SO4) has a density of 1.84 grams per milliliter. After dilution with water to 5.20-molar, the solution has a density of 1.38 grams per milliliter and can be used as an electrolyte in lead storage batteries for automobiles. (a) Calculate the volume of concentrated acid required to prepare 1.00 liter of 5.20-molar H2SO4. (b) Determine the mass percent of H2SO4 in the original concentrated solution. (c) Calculate the volume of 5.20-molar H2SO4 that can be completely neutralized with 10.5 grams of sodium bicarbonate, NaHCO3. (d) What is the molality of the 5.20-molar H2SO4?

1) What is the molarity of a 3.12 m solution of KCl dissolved in water, given that the solution has a density of 1.13 g/mL?

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please!!!!!!!

PHOSPHATE STANDARD CALCULATION HELP

Have one correct answer, stuck on where to go from ther. Urgent request, please help

1) Diluting Concentrated Nitric Acid
Calculate the volume of 15 M Nitric acid required to make 300 mL of 1.1 M nitric acid.

a) Volume of 15 M Nitric acid required

_____22.0_________ mL

2) Making the Original Phosphate Solution
You weigh out pure NaH₂PO₄.

Weight of Sodium Dihydrogen phosphate used

0.4567 g

This is dissolved, quantitatively transfered, and diluted to 100 mL in a volumetric flask.
10 mL of this is pipetted and again diluted to 100.00 mL to make the original phosphate standard.
Calculate:

b) The phosphate concentration of this solution

______________ mM

3) Making a Standard for Measurement in the Spectrometer

Volume of original phosphate standard (problem 2) used

2.50 mL

The phosphate standard, 5 mL of molybdate solution and 10 mL of dilute Nitric acid were added to a 100 mL volumetric flask, diluted to volume and mixed thoroughly.
Calculate:

c) Phosphate concentration in this standard

_______________ mM

4) Measuring the Absorbance of the Standard
The solution in 3) was put in a cuvet and the %T measured at 380 nm.

% T of solution	48.0 %
% T of blank	96.1 %

Calculate:

d) Absorbance of standard

_______________

5) Analysis of an Unknown
This is a separate problem and does not depend on 1, 2, 3, or 4.
3.51 mL of "Unknown Solution" were pipetted into a 100 mL volumetric flask along with the molybdate and nitric acid solutions. This was diluted to volume, mixed and measured in the spectrometer.

The absorbance of this solution was	0.223
The concentration of this solution (from standard plot) was	0.0070 mM

Calculate:

e) Concentration of the unknown solution	_______________ mM
f) Concentration of the unknown solution	_______________ ppm P
g) Grams of "H₃PO₄" in 450 mL of unknown	_______________ g

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