Calculate the pH, pOH, [H3O+], and [OH-] of the following solutions:
(a) 0.001 M HNO3,
(b) 0.3 M Ca(OH)2;
(c) 3.0 M HNO3,
(d) 6.0 M NaOH,
(e) 0.05 M HBr

Experimental measurement shows that 0.200 M arsenious acid, H₂AsO₃ (aq), is 0.0051% dissociated at 25 degrees Celsius. Determine the value of the acid-dissociation constant of H₂AsO₃ (aq) at 25 degrees Celsius.

briefly explain how ion exchange chromatography works. Why is the pH of the elutent changed during the seperation?

When solutions of silver nitrate and calcium chloride are mixed, silver chloride precipitates out of solution according to the equation

2AgNO3(aq)+CaCl2(aq)→2AgCl(s)+Ca(NO3)2(aq)

What mass of silver chloride can be produced from 1.51 L of a 0.201 M solution of silver nitrate?
Express your answer with the appropriate units.

The reaction described in Part A required 3.51 L of calcium chloride. What is the concentration of this calcium chloride solution?

Express your answer with the appropriate units.

For the molecular compound carbon tetrabromide, what would you multiply "molecules of CBr4" by to get the units "grams of CBr4"?

For the molecular compound carbon dioxide, what would you multiply "molecules of CO2" by to get the units "grams of CO2"?

How many ATOMS of carbon are present in 1.85 moles of carbon monoxide ? How many MOLES of oxygen are present in 3.38×1022 molecules of carbon monoxide ?

How many GRAMS of sulfur are present in 2.60 grams of sulfur dichloride

How many GRAMS of sulfur dichloride can be produced from 4.61 grams of chlorine ?

Calculate the weight % of acetic acid in the vinegar. Calculate your percent error. For this calculation, assume that the density of vinegar is 1.01g/mL.

0.8488 Molarity of acetic acid in my experiment.

I'm a little confused-if you solve it can you be sure to specify what the conversion factors are in the calculations. Thank you!

A certain material's temperature increases by 1.0 C for every 1560J that it gains. A 0.1964g sample of quinone (molar mass= 108.1 g/mol) was burnt, and the surrounding material's temperature increased from 20.3C to 23.5C. Find the molar heat of reaction for the combustion of quinone.

Dozens of pharmaceuticals ranging from Cyclizine for motion sickness to Viagra for impotence are derived from the organic compound piperazine. Solutions of piperazine are basic (Kb1 = 5.38 x 10^-5, Kb2 = 2.15 x 10^-9). What is the pH of a 0.0130 M solution of piperazine? Please explain!

For each solution, state the equation for the hydrolysis reaction that occurs and state the equation for the dissolution of the solid salt in water:

1) HCl

2) Fe(NO₃)₃

3) HC₂H₃O₂

4) NaH₂PO₄

5) NH₄Cl

6) NaCl

7) NH₄C₂H₃O₂

8) NaC₂H₃O₂

9) NaHCO₃

10) Na₂HPO₄

11) NH₃

12) NaOH

Sulfur (2.56 g) was burned in a constant volume calorimeter with excess O2(g). The temperature increased from 21.25 °C to 26.72 °C. The bomb has a heat capacity of 923 J/K, and the calorimeter contained 815 g of water. Calculate ΔU per mole of SO2 formed for the reaction

S8(s) + 8 O2(g) → 8 SO2(g)

A sample of gas contains 0.1600 mol of CH4(g) and 0.1600 mol of H2O(g) and occupies a volume of 12.1 L. The following reaction takes place: CH4(g) + H2O(g)-----3H2(g) + CO(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant. ____(?)Liters

1a.Consider a neutral carbon atom that has six electrons orbiting the nucleus. Suppose that five of the electrons are in their lowest states, but the sixth is in a very high state. Why might the energy levels for the outermost electron be similar to those for the single electron in hydrogen. (Hint: think of what is exerting an electrical force on the outermost electron)

1b.

- Arrange the standard spectral sequence - O, B, A, F, G, K, M - in order of decreasing Ha strength

1c. a) How many times more abundant is Helium than sodium

b) In general what can be said of the abundances of elements heavier than iron.

c) Calculate the ratio of iron to Uranium, iron to carbon and iron to iodine.

d) Do your values in C support what you said in B. Yes or no. Why?

1d. What do expect the formula for the combination of Potassium (K) and sulfur (S) to be ? Also the formula for Lithium(Li) to Fluoride(F)?

A mixture of carbon dioxide and nitrogen gases, at a total pressure of 889 mm Hg, contains 7.17 grams of carbon dioxide and 5.38 grams of nitrogen. What is the partial pressure of each gas in the mixture?

PCO2 =___(?)___ mm Hg

PN2 = __(?)__ mmHg

What is the pH of a solution obtained by adding 50.0 mL of 0.100 M NaOH (aq) to 60.0 mL of 0.100 M HCl (aq)?

Select one:

a. 11.96

b. 2.04

c. 3.11

d. 7.00

QUESTION 2

What is the pH of a solution prepared by dissolving 5.86 grams of propanoic acid, CH₃CH₂COOH (l), and 1.37 grams of NaOH (s) in enough water to make exactly 250.0 mL of solution. pK_a = 4.87 for propanoic acid?

Select one:

a. 4.58

b. 4.87

c. 4.75

d. 4.62

Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0010 % Pb by mass

How much of the water (in mL) contains 145 mg of Pb? (Assume a density of 1.0 g/mL.) Express your answer using two significant figures.