Chemistry - May 2007

__________ M

2007-05-22 01:18:52 · 3 answers · asked by Jim H 1

Na2CO3 + H2O --> NaHCO3 + NaOH ..... 1

NaHCO3 + H2O --> NaOH + H2O + CO2 .... 2

I need the Equilibrium Constants for both these reactions. At 25 deg C n 1 atm perhaps.

2007-05-21 23:29:17 · 2 answers · asked by Animesh J 1

What is the minimum volume in mL of 0.3867 M potassium fluoride KF solution required to precipitate as insoluble calcium fluoride CaF2 all the calcium ions from 232 mL of a 0.6199 M solution of CaCl2 solution? The balanced equation should be written to guide this calculation.

2007-05-21 20:25:32 · 2 answers · asked by Anonymous

hi i figured out the rate laws however i dont know how to get the rate constant. a little help plz? thanks!(thats a chart down there :P)

--
2 ClO2(aq) + 2 OH -(aq) ClO3-(aq) + ClO2-(aq) + H2O(l)

[ClO2]0 (mol/L)---[OH -]0 (mol/L) --Initial Rate (mol/Ls)

0.0500 -------------- 0.100 ------------ 5.75e10-2
0.100 ------------ 0.100 -------------- 2.30e10-1
0.100 ------------- 0.0500 --------------- 1.15e10-1

(a) Determine the value of the rate constant.
rate law

2007-05-21 19:09:14 · 4 answers · asked by gabjew90 1

Some distilled water was added to separate samples of (i) copper (II) nitrate and (ii) copper (II) carbonate and the mixtures stirred and filtered. New drops of sodium hydroxide solution were added to each filtrate.
What would you expect to observe with EACH filtrate?

2007-05-21 19:04:03 · 1 answers · asked by Andrea A 1

why can KMnO4 oxidise FeSO4.7H2O but not Fe2(SO4)3.9H2O.
please .it is really imp.

2007-05-21 18:52:14 · 1 answers · asked by Anonymous

2007-05-21 18:47:42 · 1 answers · asked by thisyoungg2000 1

N2F2
NF3
NF
NF2

2007-05-21 18:37:00 · 4 answers · asked by sydney 1

(a) You were asked to prepare a pure dry sample of hydrated copper (II) sulphate crystals, starting with copper (II) oxide and 100 cm³ sulphuric acid of concentration 1.0 mol dm‾ ³.
(i) Describe how, using the usual laboratory apparatus, you would prepare this sample. Write an equation for the reaction occuring. Calculate the mass of copper sulphate crystals you would expect to obtain from the preparation.
(Relative atomic mass: Cu = 64; S = 32; O = 16; H = 1)
(ii) The supply of copper (II) oxide ran out. The teacher suggested that copper oxide could be prepared by heating either copper nitrate (a deliquescent* compound) or copper (II) carbonate (a fine powder).
Which of the these two compounds is more suitable for the preparation of copper oxide? Give ONE reason for your choice.
Write balanced equations for the action of heat on a) copper (II) nitrate and b) copper (II) carbonate.
(*Deliquescent means the compound absorbs moisture from the atmosphere and dissolves in it.)

2007-05-21 18:36:44 · 2 answers · asked by Andrea A 1

2007-05-21 18:26:25 · 3 answers · asked by thisyoungg2000 1

???

2007-05-21 17:50:18 · 1 answers · asked by wlstn47 2

2007-05-21 17:16:11 · 1 answers · asked by sya_mechys 1

a. Fe: 63.5%, S: 36.5%
b. Mn: 63.1%, S: 36.9%
c. K: 26.6%, Cr: 35.4%, O: 38.0%

thanks

2007-05-21 17:09:45 · 6 answers · asked by Anonymous

temperature of the mixture. Specific Heat of gold = 0.131 J/g degree celsius. (2 component). Please help

2007-05-21 17:09:28 · 1 answers · asked by southerngold26 1

2007-05-21 17:01:55 · 5 answers · asked by Patrick B 1

for example:7.5 ml of a gaseous hydrocarbon was exploded with 36ml of oxygen.The volume of gases on cooling was found to be 28.5ml,15ml of which was absorbed KOH and the rest was absobed in a solution of alkaline pyrogallol.if all volumes are measured under the same conditions,deduce the formula of the hydrocarbon?

2007-05-21 16:30:52 · 1 answers · asked by Anonymous

Which is the correct equation?

Fe2O3 + La2+03 = LaFeO3

or,

Fe2O3 + La2+03 = 2 LaFeO3

Thanks A BUncH!,
Zach

2007-05-21 16:22:54 · 2 answers · asked by Zachary C 2

2007-05-21 16:14:53 · 1 answers · asked by Anonymous

2007-05-21 16:09:43 · 1 answers · asked by sharon b 1

i feel very ashamed because no matter how hard i tried, i just still can't balance the equation....:'((( ...can someone please tell me how i can practice balancing especially for combustion?

2007-05-21 16:08:17 · 4 answers · asked by Anonymous

I have an experiment in Chemistry to do.
Testing the manufacturers claims to whats in Alka-Seltzer tablets....anyone know how to do it?
Also....does anyone have the chemical equation of Alka-Seltzer tablets when theyre added to water?

2007-05-21 16:03:37 · 2 answers · asked by Anonymous

Bronze is an alloy of tin (MM 118.7) and copper (MM 63.55). If a 105.0 gram block of a bronze alloy has a heat capacity of 28.4 J/K, calculate the mole fraction of copper in the alloy. The Dulong-Petit constant = 24.94 J/K.mol. Enter your answer as a number with three significant figures.

2007-05-21 15:49:41 · 1 answers · asked by Division12 2

2007-05-21 15:47:36 · 3 answers · asked by Chocolate_monkey 1

Explain why a balloon filled with helium will float up, but an indentical balloon filled to the same point with air at the same temperature and pressure will not float up.

2007-05-21 15:45:03 · 2 answers · asked by apromiseibroke 1

i have rust powder and i need alumium, if i shredded a coke can, could i do the reaction

2007-05-21 15:41:40 · 2 answers · asked by daniels2ndemail 1

2007-05-21 15:34:56 · 5 answers · asked by Miami_Tennis 2

We have a solution of benzoic acid, C6H5CO2H. What is the effect of adding sodium hydroxide to this solution?

1. The pH increases.
2. The concentration of C6H5CO2H decreases.
3. The concentration of H3O+ increases.



a. 1 only
b. 2 only
c. 3 only
d. 1 and 2
e. 2 and 3

2007-05-21 15:25:44 · 3 answers · asked by Anonymous

help please...

2007-05-21 15:16:23 · 1 answers · asked by Paul W 2

Na3PO4 · 12H20 (aq) + Zn(C2H3O2)2 · 2H2O (aq) 'arrow' Zn3(PO4)2 · 4H20 (s) + NaC2H3O2 (aq) + H2O (l)

please email me @ morganelyse08@adelphia.net if that is hard to read!

2007-05-21 14:24:26 · 4 answers · asked by Morgan 1

molarity of acetic acid in vinegar needed.

2007-05-21 14:01:31 · 7 answers · asked by griepenburger 1