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A soil sample was examined for lead. A 1.765 gram sample was microwave digested with 30mL of nitric acid. The resulting solution was quantitatively transferred to a 50mL graduated tube as well as filled to the 50mL mark. A 1mL aliquot of the diluted digestate was then added to a separate 50mL graduated tube and filled to the 50mL mark. The sample was examined by GFAA and found to contain 15 ppb of lead. Explain how many ug/g of lead are in this soil sample?
600 torr contains 50.0% Helium and 50.0% Xenon by mass. What are the partial pressures of the individual gasses?
how many moles of sodium hypobromite rm nabro should be added to 1.00 rm l of 5.0times10-2 m hypobromous acid rm hbro
Explain how many liters of ethylene glycol, CH2 (OH) CH2(OH) must be added to a car radiator that contains a total of 6.5 L of coolant in order to protect the cooling system from freezing to a temperature of - 20 °C
What volume of solution should be dispensed from the buret to provide 5.633 mmol CO2-3 ? Answer in units of mL.
What happens to recrystallization if crystallization is accelerated by immediately placing the flask of hot solution from the gravity filtration into the ice-water bath
the side of the coil which cuts magnetic flux link from the north pole first becomes the live wire. Is there any reason behind that or is it just a natural phenomena?
Arsenic acid (H3AsO4) is a triprotic acid with Ka1 = 5. 10-3, Ka2 = 8. 10-8, and Ka3 = 6. 10-10. Calculate [H + ], [OH ? ], [H3AsO4], [H2AsO4? ], [HAsO42- ], and [AsO43- ] in a 0.62 M arsenic acid solution.
A scientist wants to make a solution of tribasic sodium phosphate, Na3Po4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 425 mL of a solution
How much KOH (in grams) is required to neutralize a sample of 125mL of 0.5N HCl that has just been added to 875mL of distilled water
Describe how you will prepare a H2PO4-/HPO42- buffer using solid sodium dihydrogen phosphate and sodium hydrogen phosphate (pH 7.4, 500 mL 0.40M each).
Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,\ell,m_\ell,m_s).
State an equation that represents the reaction of 2% ethanolic PbP solution with 4Methyl cyclohexene and name the product
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