Chemistry - July 2007

A sample of Sodium Chloride solution has a total mass of 51.623 grams of NaCL in a total volume of 834.21mL of solution. Calculate molarity?

2007-07-12 05:43:07 · 6 answers · asked by ... 3

2007-07-12 05:41:12 · 4 answers · asked by ... 3

A stock solution of Calcium Chloride is 0.5574 molar. A 33.57ml sample of this stock solution is diluted to 500.00ml. Calculate the molaroty of the diluted solution?

2007-07-12 05:40:09 · 2 answers · asked by ... 3

Oxalic acid reacts with hydroxide:
C2H2O4+2NaOH>Na2C2O4+2H2O

0.2567 grams of pure, dry oalic acid is weighed out and dissolved in an unknown amount of water, but less than 30 milliliters. This solutionis titrated to the phenolphthalein endpoint using a solution of NaOH of unknown molarity. It takes 27.35 milliliters of NaOH solution to reach the endpoint. Calculate the molarity of the unknown NaOH solution.

2007-07-12 05:38:03 · 2 answers · asked by ... 3

If you titrate 1.502g of KHC8H4O4 with 37.28 ml of NaOH solution what is the concentration of the NaOH solution?

i got the eq. as KHC8H4O4+NaOH>KNaC8H4O4+H2O

Also, i know u need to know the number of moles to determine of NaOH in 37.28 ml or 0.03728l .

Pleas help

2007-07-12 05:32:03 · 3 answers · asked by ... 3

i made a shot glass outta flux core and i don't know if i can drink outta it. anyone know if its safe?

2007-07-12 05:29:12 · 6 answers · asked by lilbigmoe16 1

A 5.00-L tank contains helium gass at 1.50 atm.

2007-07-12 05:21:50 · 4 answers · asked by Anonymous

2Mg + O2 -- 2MgO

2007-07-12 05:19:08 · 4 answers · asked by Anonymous

Consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane

Not sure but is the answer: dialysis or osmosis??

2007-07-12 05:13:59 · 4 answers · asked by Anonymous

Also I going to need the ph level of each or what color it turns when red cabbage indicator is added.

2007-07-12 05:00:34 · 5 answers · asked by Anonymous

How can you make a tri-halogen benzene ring, such that one is F, one is I, and the other is Br, alternating?

2007-07-12 04:26:55 · 2 answers · asked by chemistry! 1

2007-07-12 04:21:09 · 23 answers · asked by Madkiller24 1

Thanks!

2007-07-12 02:41:25 · 6 answers · asked by Anonymous

Usually, it's solid to liquid to gas and vice versa. How come some substances sublime without passing through the liquid phase? please connect it the intermolecular forces and kinetic energy. Ty!

2007-07-12 02:37:42 · 4 answers · asked by jaryllechu 2

Thank you very much!

2007-07-12 02:06:32 · 1 answers · asked by Anonymous

The separating of solid from a liquid is about filtration and decantation. What are the difference?

2007-07-12 01:53:13 · 2 answers · asked by heizel 2

pLEase.,.,!!! heLP me,., i reaLLy neeD it nOW!!!!!!!!!!

2007-07-12 01:51:40 · 3 answers · asked by charizz 1

2007-07-12 00:20:35 · 2 answers · asked by Anonymous

2007-07-12 00:08:23 · 9 answers · asked by Anonymous

2007-07-11 21:29:54 · 2 answers · asked by Anonymous

HNO3 + Mg(OH)2 >>> HOH + Mg(NO3)2

2007-07-11 21:29:22 · 3 answers · asked by Anonymous

What will be this proportion?

2007-07-11 20:49:36 · 4 answers · asked by paul 4

I was brought a 1 L perchloric acid and it show a little information on the bottle. its said:

perchloric acid 65 %

so, I want to known the concentration of perchloric acid in this bottle please anyone Help me. and let me knwon how to calculate it.

thanks.

2007-07-11 19:39:30 · 4 answers · asked by impressiontick 1

2007-07-11 18:08:57 · 16 answers · asked by hanamay g 1

2007-07-11 16:54:33 · 1 answers · asked by Andre k 1

2007-07-11 16:45:00 · 1 answers · asked by Andre k 1

I'm doing an electrolysis experiment. I have one jar (4 Litres of water) and have placed 2 copper electrodes in the jar. I added 5% salt to the water. I filled 2 test tubes to the top with water, covered the top and submerged it in water over the electrodes. I'm using a DC power supply. For some reason the water in the test tube connected to the negative end of the power supply is dropping dramatically, therefore it must be producing hydrogen (I checked this with a 'pop' test). However, the water connected to the positive end (anode_ of the power supply hasn't dropped at all. And aren't I meant to see a 2:1 ratio. I also noticed that the water was turning to a bluish greenish colour. I reduced the sodium chloride concentration to approx. 1.7%. However, still no oxygen was produced. Could someone please help me. If you have further questions, you may email me. This is urgent, so could someone please help me.

2007-07-11 16:36:42 · 3 answers · asked by Anthony 4

If the atomic radius of metallic ytterbium is 193.92 pm, and the density of the metal is 6.96 g/mL, what type of unit cell does metallic ytterbium contain?

2007-07-11 16:07:59 · 2 answers · asked by Anonymous

i need a 15 minutes video, of an inorganic chemical...something that talks about it !! please help meª

2007-07-11 15:51:11 · 1 answers · asked by axenstar91 1

2007-07-11 14:00:12 · 1 answers · asked by mimizzaby 1