Chemistry - January 2007

Solubility of Sodium Sulfate decreases sharply on cooling from 50 deg C to 0 deg C and crystals are obtaind during cooling. Will the crystals heat or cool pure water during redissolution, if the pure water is at room temperature.(say, 30 deg. C)?(Assume adiabatic conditions, i.e no heat is given to or taken from the system)

2007-01-25 03:14:35 · 1 answers · asked by Nandkumar 1

Sulfite ion, SO3^(2-), can be oxidized to SO4^(2-) using hydrogen peroxide. A 0.01610 g sample, which was 32.41 % sulfite, was treated with hydrogen peroxide and a solution of BaCl2. How many grams of BaSO4 should be produced?

2007-01-25 02:49:52 · 2 answers · asked by Alan l 1

2007-01-25 02:49:48 · 2 answers · asked by alanis118 1

given a 1M solution of HAc, and that [H_3_0+] =.001 M, how would you calculate [Ac-] and [HAc] at equalibrium?

2007-01-25 02:25:17 · 1 answers · asked by BMac 3

how would you calculate the pH of 0.5M NaOH, or 2 M HCl, or 3e-8 M HCl?

2007-01-25 02:24:33 · 1 answers · asked by BMac 3

given a 1M solution of HAc, and that [H_3_0+] =.001 M, how would you calculate [Ac-] and [HAc] at equalibrium?

2007-01-25 02:18:44 · 1 answers · asked by BMac 3

given a 1M solution of HAc, and that [H_3_0+] =.001 M, how would you calculate [Ac-] and [HAc] at equalibrium?

2007-01-25 01:58:45 · 1 answers · asked by BMac 3

how would you calculate the pH of 0.5M NaOH, or 2 M HCl, or 3e-8 M HCl?

2007-01-25 01:53:15 · 1 answers · asked by BMac 3

I had did a bradford assay with 5 diff standards namely 0.01mg/ml, 0.02mg/ml, 0.03mg/ml , 0.04mg/ml and 0.05mg/ml and have measured the absorbance at 595nm agaisnt a blank. The pts that i had plot does not really give me a prefect st line graph, can anyone explain it? Also the most imp qn is whether the line should pass thru x-y axis at 0, I feel it should as I had measured the abs against a blank.

2007-01-25 01:11:13 · 2 answers · asked by jakkubuyz 1

Could you explane to me how to get the answer for this?
Thanks for the help.

2007-01-25 01:02:39 · 1 answers · asked by Heavy Metal 3

Could anyone help?
Thank you.

2007-01-25 01:01:31 · 4 answers · asked by theseraphslayer 1

Does anyone know what the actual best way is?
Thanks!

2007-01-25 00:52:41 · 3 answers · asked by theseraphslayer 1

2007-01-25 00:48:12 · 2 answers · asked by MachoMan 4

HCl and HI are equally strong acids in water but in pure acetic acid, HI is a stronger acid than HCl. Why?
and
Reactions requiring either an extremely strong acid or an extremely strong base are carried out in solvents other than water. Why is this necessary?

2007-01-24 23:14:07 · 3 answers · asked by Anonymous

2007-01-24 22:40:35 · 1 answers · asked by => the guy <== 3

2007-01-24 22:15:02 · 16 answers · asked by Anonymous

2007-01-24 22:01:25 · 8 answers · asked by Anonymous

2007-01-24 21:33:12 · 8 answers · asked by Xing Xing 1

2007-01-24 20:44:47 · 11 answers · asked by Anonymous

Given 5ml and 10ml pipets and 50 ml and 100-ml volumetric flasks, what are the possible concentrations you could make in one dilution of the NaCl solution above? (given 0.6593g of NaCl in a 100ml volumetric flask (0.1M)) What are the max and min concentrations that you could make by doing a second dilution?

2007-01-24 20:23:08 · 2 answers · asked by AmandaLiu 1

2007-01-24 19:40:50 · 6 answers · asked by => the guy <== 3

how does it give strength?

2007-01-24 19:09:52 · 2 answers · asked by Anonymous

That's all I need.
Any detailed answers on it? and how/why it occurs?

Thanks

2007-01-24 18:50:58 · 2 answers · asked by jus me 2

I have science homework and I need help. I don't get it.

2007-01-24 18:46:29 · 10 answers · asked by Daniel 1

2007-01-24 18:23:56 · 1 answers · asked by potejanee s 1

can someone please tell me what the scientific principles are for the experiment of finding out how hair dye affects hair. please can anyone help im so lost! i dont even know what a principle is!

2007-01-24 18:16:03 · 2 answers · asked by Londoner 1

2007-01-24 17:59:17 · 1 answers · asked by fathotra 1

I am wondering if there is a formula that would tell me the time required for a pot of water to boil assuming you know:

1. The volume of water
2. temperature at which the stove is set.

Thank you

2007-01-24 17:59:05 · 5 answers · asked by ? 1

2007-01-24 17:34:10 · 1 answers · asked by marie_duals 1

Dry Hydrogen gas exerts 500 torr and an equal amount of wet hydrogen gas exerts 500 torr & both have same temperature. Which has the greater # of moles of hydrogen and why?

2007-01-24 17:14:43 · 6 answers · asked by malasunas 3