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question from the chem lab : spectrophotometric determination of an equilibrium constant. indicator is Bromcresol Purple. 1) would your absorbance value to be too high or too low if the level of indicator were above the mark on the pipet when delivered to the flask?explain your answer
a 25- sample of an alloy at 98 is placed in 50. water at 19.if the final temperature reached by the alloy sample and
There are more electrons in the n = 4 shell than for the n = 3 in kryton. Thus, the peak in the radial distributions smaller for the n = 4 shell than n = 3 shell. Elucidate this fact
A 0.1000M solution of ethanoic acid (HC2H3O2) is only partially ionized so that [H+]=2.25X10^-3M. What is the acid dissociation constant for this acid?
If the molar concentration of sodium carbonate (Na2CO3) is 2.5 mM millimolar, explain what is the mass concentration of Na2CO3 in mg/L? For the same molar concentration, define what is the mass concentration of Na+
What is the boiling point of a 4.08 m solution of naphthalene in benzene. The boiling point of benzene is 80.1°C. here is some information to help you on this problem.
calculate the amount of heat required to heat a 3.9 gold bar from 27 to
Calculate the standard enthalpy of solution of AgBr(s) in water from the enthalpies of formation of the solid and the aqueous ions
what the molarity of H2SO4 if 15.85 mL of the solution is needed to neutralize 1.00g NaHCO3 molar mass 84.01 g/mol
10mL of 0.1M HNO2 (nitrous acid, ka=4.0x10^-4)is titrated with a .01M KOH solution. After 10mL of the KOH solution is added, what will be the pH in the titration flask?
How much energy is dissipated as heat, which is exchanged btwn the system and the heat-sink?C. What is the delta U for the above process?
Portable heater transfers 255 W to 5.5 L water, where 1 W = 1J/s. How many minutes will it take for the heater to heat 5.5 L water from 25 degrees C to 42 degrees C? Assume water has density of 1.0 g/mL
The solution has a vapor pressure of 262 . Pure pentane and hexane have vapor pressures of 425 and 151 , respectively, at room temperature.What is the mole fraction of hexane? (Assume ideal behavior.)
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