Chemistry - April 2007

An alcoholic iodine solution ("tincture" of iodine) is prepared by dissolving 5.55 g of iodine crystals in enough alcohol to make a volume of 245 mL. Calculate the molarity of iodine in the solution.

I've put in a million different answers to my web assingment but it won't give it to me.

The molar mass of Iodine is 126.9

2007-04-01 13:47:53 · 4 answers · asked by Matt S 1

2007-04-01 13:46:41 · 1 answers · asked by lilprincess_2good4u 1

2007-04-01 13:44:06 · 1 answers · asked by lilprincess_2good4u 1

1. KOH(aq) + FeCl3(aq) ----
2. Al(s) + Br2(l) -----
3.C5H10(l) (pentane) + O2(g) -----

2007-04-01 13:41:31 · 2 answers · asked by Anonymous

Just need some examples for an experiment with ppolymers please don't put something that is already made be crative!!!!!!

2007-04-01 13:29:36 · 2 answers · asked by Tasha L 1

2007-04-01 13:25:26 · 2 answers · asked by bunny 1

In doing an equilibrium reaction, (e.g. acetic acid + isopentyl alcohol <-----> isopentyl acetate + H20) why would you use H2SO4 (which has a higher pKa) instead of HCl (lower pKa) as the acid catalyst?

2007-04-01 13:24:51 · 1 answers · asked by Anonymous

2007-04-01 13:22:14 · 3 answers · asked by bunny 1

I have no clue!!! Please someone show me how in an easy manner!!!! Thank you!

2007-04-01 13:20:13 · 1 answers · asked by COOL KID 2

What is the pH of a solution prepared by mixing exactly 59.7 mL of 0.200 M HC2H3O2 with 21.1 mL of 0.400 M KOH? (Ka for acetic acid 1.8*10-5). Report your answer to 3 decimal places.

I got 8.959 for this question, but it was incorrect. Could anyone please tell me what they get and how they get it? Thanks.

2007-04-01 13:17:07 · 1 answers · asked by Ryan C 1

2007-04-01 13:00:21 · 3 answers · asked by bigkuntry020368 1

this is my chemistry H.W please help me

2007-04-01 12:52:45 · 4 answers · asked by Eden 1

How can I find the pH of a solution prepared by the addition of 100mL of 0.15M HCl solution to 100mL of 0.2M of NaOH?
This wouldn't be as hard if I was given a Ka or Kb value, but I'm not.

Thanks

2007-04-01 12:49:56 · 2 answers · asked by bigmanonthewall 3

2007-04-01 12:46:12 · 3 answers · asked by fashionistaqt 3

There are two answer choices that would correctly complete this sentence.

a) buffer

b) increase the concentration of

c) neutralize

d) decrease the concentration of

Could someone PLEASEEE provide the answer to this question!

thanks in advance!

2007-04-01 12:45:57 · 9 answers · asked by calculushelp1990 1

where, when, who, what, and how is technetium used?
where, when, who, what, and how is promethium used?
AND
where, when, who, what, and how is technetium mined and otherwise isolated for use?
where, when, who, what, and how is promethium mined and otherwise isolated for use?

2007-04-01 12:40:26 · 2 answers · asked by ♥ii L0v3 Mii Liif3 2

What is the state in which the concentration of the reactants and products remain constant over time?

a)forward reaction

b)reverse reaction

c)chemical equilibrium

d) rate


Please help!!

An explanation would be greatly appreciated!

2007-04-01 12:38:15 · 4 answers · asked by calculushelp1990 1

A saturated solution of silver nitrate is prepared in 100 g of water at 20 ºC. The solution is then heated to 50 º C. How much more silver nitrate must now be added to obtain a saturated solution?

2007-04-01 12:34:41 · 1 answers · asked by Anonymous

How would one go about finding the pH of orange juice, using titration and the inverse log function?

2007-04-01 12:28:50 · 2 answers · asked by megan6288 1

This was a question for a Food Chemistry class, and I am throughly confused. Any help would be greatly appreciated.

If .35g of antacid contains .125g of Ca(OH)2, and you add 25ml of .1M HCl, how much base will you need to reach the end point?

2007-04-01 12:26:08 · 1 answers · asked by megan6288 1

2007-04-01 12:26:04 · 1 answers · asked by 8 3

2007-04-01 12:23:25 · 1 answers · asked by Anonymous

2007-04-01 12:18:10 · 5 answers · asked by Science Geek 1

2007-04-01 11:53:00 · 1 answers · asked by frederque j 1

An aqueous copper sulfate (CuSO4) solution is electrolyzed. Copper metal is formed at one electrode, and oxygen gas at the other. Which one of the following statements is true?

The copper electrode is the cathode.

Electrons flow in the circuit towards the oxygen-evolving electrode.

The copper electrode is positive.

SO42- ions flow towards the copper electrode in the solution.

OH- ions are generated at the oxygen-evolving electrode.

2007-04-01 11:31:50 · 1 answers · asked by Anonymous

Why is there Hg2 ^2+ (mercury II) ?

2007-04-01 11:00:41 · 1 answers · asked by Anonymous

2007-04-01 10:39:02 · 3 answers · asked by Anonymous

based upon the equation of cobalt nitrate and sodium phosphate which ions might be dissolved in filtrate. Also how would I draw a picture that represents the reaction @ the molecular/ionic solution of cob. nitrate & sodium phosphate before solution was filtered?

2007-04-01 10:26:52 · 2 answers · asked by susan v 1

Ursolic acid is a substance found in the protective wax-like coating of apples, pears, and other fruits. It has the following elemental analysis: C- 78.90%, H- 10.59%, and O- 10.51%, compute its empirical formula. If its molar mass is determined to be 460.g/mol, determine its molecular formula and exact molar mass (to 5 significant figures).

2007-04-01 09:34:36 · 2 answers · asked by jane_rocks213 1

2007-04-01 09:34:36 · 1 answers · asked by Mr. Pheterson 2