Chemistry - March 2007

The Ka of HSO4- (aq) is 1.2 x 10^-2. Which of the following is the BEST approximation of the pH of a 0.0500 M solution of H2SO4 (aq) to 2 significant figures?

a) pH is exactly 1.3
b) pH is exactly 1.0
c) pH is exactly 1.6
d) pH is less than 1.0
e) pH is between 1.0 and 1.3

Please provide some explanations. Thanks!! :)

2007-03-18 15:46:39 · 2 answers · asked by 123haha 1

and also give your explanation about the experiment you shared to me.

2007-03-18 15:46:25 · 3 answers · asked by mac 2

anyone know how to do this?
Balance the following chemical equations...( sorry if this is hard to read because of the numbers. The numbers go down you know kind of on the bottom not right next to the equation!
1)HCl+Ca(OH)2 arrow CaCl2+H2O
2)KClO3 arrow KCl +O2
3)K3PO4+HCl arrow KCl+ H3PO4
4) S+O2 arrow SO3
5)Kl+Pb(NO3)2 arrow KNO3 + Pbl2
6)CaSO4+AlBr3 arrow CaBr2+ Al2(SO4)3
7)H2O2 arrow H2O+O2
8)Na+H2O arrow NaOH+H2
9)C2H6+O2 arrow CO2+H2O
ready for the last and hardest one?
10) Mg(NO3)2 +K3PO4 arrow Mg3(PO4)2 +KNO3
Thank you so much for whoever answered,I truly appreciate it!

2007-03-18 15:37:25 · 5 answers · asked by lover2 1

Chiral carbons: I tryied 3 , 0 , 8 they are not the correct answers plz help

....CHO
.....I
H-C-OH
.....I
HO-C-H
.....I
H-C-OH
.....I
H-C-OH
.....I
CH2OH

2007-03-18 15:35:54 · 1 answers · asked by jeniferrrr 1

when 1.0 L of each of the two solutions are mixed?
a) 0.2 M HNO3 and 0.4 M NaOH
b) 0.2 M HNO3 and 0.4 M NaNO3
c) 0.2 M HNO3 and 0.4 M HF
d) 0.2 M HNO3 and 0.4 M NaF

2007-03-18 15:30:10 · 1 answers · asked by Anonymous

Calculate the solubibilty of Mn(OH)2 in grams per liter when buffered at pH a) 7.0, b)9.5, c)11.8


Mn(OH)2 Ksp=1.6x10^-13

I thought I was doing it right , but my numbers are messed up.

2007-03-18 15:28:54 · 2 answers · asked by __ 3

2.28 g of Octane is completely burned in 7.00 g of Oxygen...CHEMISTRY HELP!?

1) Which is the limiting reagent?
Why?

2) How much water vapor can be produced?
How?

2007-03-18 15:16:45 · 1 answers · asked by kickitup21 1

Does anyone know where I can buy helium tanks that can be refilled? If so where would I go? I need locations in Ontario Canada.

Thank you

2007-03-18 15:14:06 · 1 answers · asked by Anonymous

3.45 grams of iron (ii) chloride was mixed with potassium permangante and hydrochloric acid to yield iron (iii) chloride, manganese (iv) chloride, potassium chloride, and water. how many moles of hydrochloric acid were produced and how many grams manganese (iv) chloride were made in the reaction.?


please help..

2007-03-18 15:04:11 · 2 answers · asked by Anonymous

2007-03-18 14:59:55 · 1 answers · asked by snowangels 2

2007-03-18 14:59:12 · 1 answers · asked by snowangels 2

6.56 grams of copper metal is added to concentrated nitric acid to yeld nitrogen momoxide, water, and copper(ii) nitrate. how many grams of nitric acid were used to fully react with the copper metal??

somebody help cause im really stuck.
thanks...

2007-03-18 14:55:55 · 4 answers · asked by Anonymous

How do you determine the unknown concentration of NaOH, the strong base from the graph (the equivalence point data) We have the volume vs pH graphed on the titration curve. Also we have the concentration of the weak acid (acetic acid) and its volume, as well as the volume of NaOH

2007-03-18 14:52:10 · 1 answers · asked by Belle 3

When filled with ether, the total mass was found to be 59.115g. What is the denisty of ether?

2007-03-18 14:34:20 · 1 answers · asked by angeybutt 1

Student A 13.8, 13.4, 13.0 g/mL
Syudent B 13.4 13.3, 13.3 g/mL
Sudent C 13.9, 13.8, 14.1 g/mL
Which results are accurate ?
Which results are most precise.

2007-03-18 14:31:35 · 2 answers · asked by angeybutt 1

2.28 g of Octane is completely burned in 7.00 g of Oxygen...HELP!?

1) Which is the limiting reagent?
Why?

2) How much water vapor can be produced?
How?

2007-03-18 14:29:22 · 1 answers · asked by kickitup21 1

The density of tin is 7.28g/mL

2007-03-18 14:26:36 · 1 answers · asked by angeybutt 1

2007-03-18 14:23:05 · 2 answers · asked by angeybutt 1

1.why Salt water, calcium chloride, and baking soda are ionic compounds.
2.why Distilled water and Sugar is molecular are molecular compounds.

2007-03-18 14:19:41 · 2 answers · asked by infamous_amour 2

I have a school project in which I must mail someone and ask them questions about how they use platinum. Any suggestion of specific places, not things like "jewelry store?

2007-03-18 14:15:52 · 2 answers · asked by Anonymous

What are the reagents and conditions

2007-03-18 14:10:51 · 2 answers · asked by Joyce 4

Distilled Water
Salt Water
Sugar
Calcium Chloride
Baking Soda
* im in serious need of helppp

2007-03-18 14:06:14 · 4 answers · asked by infamous_amour 2

2007-03-18 14:00:08 · 3 answers · asked by Lauren s 1

What mass of hydrogen contains the same number of atoms as 5.83 g of nitrogen?

I have no idea how to do this! =( It's my last question!

2007-03-18 13:59:56 · 4 answers · asked by nomad 2

For each of the noble gases (except helium) the outermost occupied main energy level contains how many electrons?


6, 2, 8, 4, 20

2007-03-18 13:37:58 · 2 answers · asked by theoneandonly4251 2

Can you please explain how you get the answer!!? Do you count the stop codon since you don't have match for it?

2007-03-18 13:29:48 · 1 answers · asked by sumantha m 1

core electrons protons neutrons or valence electrons?

Also Covalent bonds involve? electrostatic forces a sharing of electrons a transfer of electrons different charges?

2007-03-18 13:26:28 · 2 answers · asked by theoneandonly4251 2

Two moles of H2O(g) at 1.00 atm and 100.°C occupy a volume of 61.2 L. When two moles of H2O(g) are condensed to two moles of H2O(l) at 1.00 atm and 100.°C, 81.32 kJ of heat is released. If the density of H2O(l) at this temperature and pressure is 0.996 g/cm3, calculate E for the condensation of two moles of water at 1.00 atm and 100.°C in kJ.

2007-03-18 13:19:27 · 1 answers · asked by help 1

2007-03-18 13:16:29 · 8 answers · asked by Anonymous

No stupid answers please

2007-03-18 13:04:57 · 4 answers · asked by Anonymous