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a buffer is to be made with a ph of 850 by adding hydrobromic acid to one of the following bases which base is the best
the active ingredient in acetylsaliclic acid was isolated what does it mean is my experimental melting point range was
a clear blue unknown solution tested neutral to indicator paper there was no reaction when this unknown was tested with
a clear colorless unknown solution was divided into four separate test tubes nothing was observed when koh was added to
for 1 mol of an ideal gas pext p 101 kpa pressure remains constant the temperature is changed from 100 degrees c to
a flask contains 400 ml of 05 m phosphate buffer that has a ph of 72 what volume of 05 m naoh should be added to
7 200 moles of an ideal gas at 200 degrees c expands isothermally from an initial volume of 200 l to a final volume of
if a solution of compound s mw 300 with a known of 40000 at max of 360 nm gave an absorbance of 10 in a 100-cm cell
in the experiment separation of the components of a mixture a student found that her mixture was 13 nh4cl 18 nacl and
john dalton the father of the atomic theory of matter said that all atoms of a given chemical element are identical
a sample of magnesium with a mass of 100 g is burned in oxygen to produce an oxide with a mass of 166 g of magnesium
what is the mass percent of the helium in a mixture that has an equal number of he and ch4
there are two stable isotopes of copper their masses are 629296 amu and 649278 amu if the average atomic mass of copper
the carbonyl peak of benzaldehyde appears as a very strong and intense peak at 1703 cm -1 normally the carbonyl peak of
a flask contains 400 ml of 5 m phosphate buffer that has a ph of 75 what volume of 1 m hcl should be added to drop the
an organic compound was synthesized amp a sample of it was analyzed amp found to contain only c h n o amp cl it was
the substances nacl na2co3 mgso4 and nh4cl used for test solutions are all soluble ionic compounds for each substance
the mineral bauxite which is mostly al2o3 is the principal industrial source of aluminum metal how much aluminum can be
the element gallium has two naturally occurring isotopes 69ga and 71ga the atomic mass of 69ga is 689256 amu and 71ga
a gas follows the equation of state pv nrt1ap where a is a constant for this gas show that a 1t and k 1p1ap and
a bank teller is asked to assemble 1 set of coins for his clientseach set is made up of three quartersone nickel and
calculate the residual volume for a gas with the redlich-kwong equation of state interpret the result if there is a
how many isomers of the alkenes having the molecular formula c6h12 would have trans or e in their