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You order two primary standards of ultra pure K2SO4 (174.260 g/mol) and Na2SO4 (142.043 g/mol) for an experiment. When they are delivered, their labels are so damaged that you cannot tell which is which. You decide to perform a precipitation reaction to determine which bottle contains which compound. You re-label the containers A and B. You then take 0.1657 g of pure reagent from bottle A, dissolve it in 100.0 mL of water, and titrate it in a precipitation titration against 0.0424 M Ba2+. The volume of Ba2+ required to reach the endpoint is 22.40 mL.
What is the calculated molar mass of the sulfate present in bottle A?
the diprotic acid H2B is being titrated against .04M NaOH. H2B has 40mL, .2M concentration, Ka1+2.5*10^-3, Ka2=3*10^-10. What are the concentrations of each species in the following pts in the titration
1. approximately 80 of the mass of a human body consists of aqueoussolutions spinal fluid blood etc. these solutions
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3.
a student carried out the experiment but did not follow the directions exacly as written. What effect would the following actions have on the experiment ?
An aqueous solution of nickel acetate is electrolyzed for 3 hours with a 1.8 ampere current. What mass of nickel is produced?
Calculate the pH of a solution made by mixing 2.0 M HF and 2.0 M HCN. Also calculate the concentration of CN- ion at equilibrium.
using a sample that was dissolved in ch2cl2 mixed alumina evaporated the ch2cl2 loaded and began to run his column
A microwave oven operates at 2.40 GHz. What is the wavelength of the radiation produced by this appliance? in nano meters
explain how to correct for the partial of water vapor when calculating the partial pressure of a dry gas is collected
A 10.0 mL aliquot of the solution is titrated with a standard 0.101 M KSCN solution, requiring 7.0 mL to reach the red Fe(SCN)2+ end point. Calculate the percent mass of silver in the sample.
the exhaled air contains 6.2% H2O and 15.3% O2 by volume. How many moles of H2O are expelled from the body each minute? How many moles of O2 are absorbed by the body each minute?
A 32.0 iron rod, initially at 22.0C, is submerged into an unknown mass of water at 63.7C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 59.4C.
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