Chemistry - June 2007

The amino acid glycine is often
used as the main ingredient of a buffer in biochemical experiments.
The amino group of glycine, which has a pKa of
9.6, can exist either in the protonated form (ONH3
) or as
the free base (ONH2), because of the reversible equilibrium
R-NH(3)+ ------>R-NH(2) + H+

(a) In what pH range can glycine be used as an effective
buffer due to its amino group?
(b) In a 0.1 M solution of glycine at pH 9.0, what fraction
of glycine has its amino group in the ONH3
form?
(c) How much 5 M KOH must be added to 1.0 L of 0.1 M
glycine at pH 9.0 to bring its pH to exactly 10.0?
(d) When 99% of the glycine is in its ONH3
form, what
is the numerical relation between the pH of the solution and
the pKa of the amino group?

How do i even start with this problem? Any hints appreciated.

2007-06-07 09:24:19 · 3 answers · asked by untamedblade 1

2007-06-07 09:18:04 · 1 answers · asked by asef2121 1

Why would the incomplete combustion of a hydrovarbon in an enclosed area be dangerous?

2007-06-07 08:49:52 · 6 answers · asked by flowers4eden 1

2007-06-07 08:39:09 · 5 answers · asked by Anonymous

how meny complex solution are?

2007-06-07 08:35:08 · 2 answers · asked by kry_kry 1

2007-06-07 08:24:47 · 6 answers · asked by Anonymous

2007-06-07 08:04:39 · 2 answers · asked by shadow6741 1

How many grams of Nacl are needed to make 400 ml of a .100 M solution? I know the answer is 2.34 g, but I need a clear simple step by step explanation

2007-06-07 08:02:39 · 2 answers · asked by Anonymous

Me and my friend are going to toilet paper this persons house and we want to hide something under her porch so it will stink and they can't find it. I have a few eggs sitting all ready but I want something really good. Stinkbombs don't really work because they will go off before they're out there.
Any ideas?

2007-06-07 07:34:09 · 4 answers · asked by Carlitolover 2

a gas contained in a piston has a pressure of 100torr and a volume of 1.0L. determine the pressure of the gas if it is compressed to a volume of 0.75L?

2007-06-07 07:31:52 · 1 answers · asked by mommy Ty 3

If I stored a bunch of gas cans, would the gas go bad?
If so, how long would it last?

2007-06-07 07:27:04 · 1 answers · asked by Anonymous

CO, PM-10, S02, O3, Pb

2007-06-07 07:23:57 · 3 answers · asked by mommy Ty 3

Just started reading some articles about future research and was curious to see in what direction people think chemistry research is headed.

2007-06-07 07:11:14 · 4 answers · asked by Patrick 2

what are the chemical / molecular phenomena occurring that cause this gloss resultant and "chalking"

2007-06-07 07:06:02 · 1 answers · asked by taulmachof 1

For instance, will ice whose temperature has been lowered to 0 degrees Farenheit or less remain as ice longer and/or melt slower than ice formed at 30 degrees Farenheit?
Another longest lasting ice question...

2007-06-07 07:05:22 · 6 answers · asked by Anonymous

2007-06-07 06:45:23 · 5 answers · asked by friend 1

a) oxygen
b) potassium
c) hydrogen
d) no element increases its oxidation number

2007-06-07 06:37:42 · 4 answers · asked by Steph 2

2007-06-07 06:31:37 · 4 answers · asked by yemi b 1

the number of electrons shells
the number of covalent bonds it can form
the number of neutrons
the number of electrons
the number of protons

2007-06-07 06:30:54 · 3 answers · asked by Alex 4

protons, ions, electrrons, neutrons or hydrogen bonds?

2007-06-07 06:30:03 · 1 answers · asked by Alex 4

When the total no. of electron pairs surrounding a central atom in a molecule is 7 and there is no lone pair, then all the electron pairs are bond pairs. The molecule has pentagonal bipyramidal geometry.
But when there are 6 bond pairs and 1 lone pair electron surrounding the central atom, "where should be the location of the lone pair electron-----in one of the equatorial positions or in one of the axial positions..????"

Further what is the name of such type of geometry????

or rather what is the geometry of XeF6..????

2007-06-07 06:29:04 · 3 answers · asked by AD 1

Is there a formular from it. Pls help.

2007-06-07 06:17:11 · 10 answers · asked by yemi b 1

2007-06-07 06:15:42 · 1 answers · asked by zerald 1

a. HF+KOH

b. H3PO4+Ca(OH)2

c. HBr+Mg(OH)2

2007-06-07 06:02:26 · 2 answers · asked by ♥chloe♥ 2

Vitamin C can be added to applesauce to inhibit it from becoming brown in color when exposed to the air. Discuss below how this protection occurs based on the reactions of Vitamin C and its possible role as a sacrificial antioxidant.

2007-06-07 06:00:56 · 2 answers · asked by tiff 2

2007-06-07 05:44:06 · 5 answers · asked by Anonymous

why is the molarity of NaOH in an acid based titration calculated?

2007-06-07 05:38:14 · 3 answers · asked by simple_smilez23 2

The pH scale is a measurement of the acidity and basicity of compounds.

True or False?

2007-06-07 05:34:46 · 10 answers · asked by stimpy00777 1

A conjugate acid-base pair differs by several H+ ions.

true or false?

2007-06-07 05:33:47 · 4 answers · asked by stimpy00777 1

K2Cr2O7 + H2O + S -> KOH + Cr2O3 +SO2


a) Cr
b) S
c) K
d) O

2007-06-07 05:29:31 · 2 answers · asked by Steph 2