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1) Dichromate and ferrous ions react in acidic solution to form chromic and ferric ions, respectively. If 1.285 grams of iron(II) bisulfate dissolved in sulfuric acid solution requires 35.78 mL of sodium dichromate solution for complete titration, what is the molarity of the sodium dichromate solution? Show the balanced net ionic and complete chemical equations for this reaction.
2) The sodium dichromate solution from Problem 1 was used to titrate a solution made by dissolving 3.500 g of a pure ferrous salt in sulfuric acid. The titration required 47.22 mL of the sodium dichromate solution. Calculate the percent by mass of iron in the pure salt. The net ionic equation here is the same as in Problem 1. You will not be able to write a balanced molecular equation for this because the anion in the ferrous salt was not specified in this problem.
Identify invent a salt which has a weak acid as it's cation and a weak base as its anion so that the salt would yield an acidic solution in water.
Calculate the mass defect of the fluorine nucleus19/9F . The mass of neutral is equal to 18.998403 atomic mass units. Calculate the binding energy Eb of the fluorine nucleus 19/9F . Calculate the binding energy per nucleon of the fluorine nucleus ..
When atomic absorption spectrophotometer had been allowed to adequately equilibrate, a blank determination of absorbance gave the following results.
Problem- The main cables supporting New York's George Washington Bridge have a mass per unit length of 4100 kg/m and are under tension of 250 MN. At what speed would a transverse wave propagate on these cables
a buffer solution is made as followed i adding 13.50ml of0.200moll sodium hydroxide to 50.00 ml of 0.100m propanoic
The distance between adjacent wave crests is called
which produce no significant response to interfering ions. It is then used to measure the pH of 0.0100 M NaOH in 0.50 M NaCl at 25 degrees C. What is the observed pH under these conditions if the true pH is 1.13?
A refrigeration system contains 575 ml of a gas at 22 degrees C and 1.25 atm. The gas is compressed until it has a pressure of 2.00 atm and a temperature of -6 degrees C. What is the new volume of the gas in the system
When a rod of metallic lead was added to a 0.0100M solution of Co^+3, it was found that 68% of the cobalt in solution was reduced to Co^+2 by the lead. Find the value of K for Pb + 2Co^+3 = Pb^+2 + 2Co^+2
A 224mL sample of an aqueous solution contains 2.80% MgCl2 by mass. Exactly one-half of the magnesium ions are Mg?28, a beta emitter with a half-life of 21 hours
When solving this problem, assume that no heat is lost from the calorimeter to the surroundings, the density of all solutions is 1.00 g/mL, the specific heat of all solutions is the same as that of water, and volumes are additive.
Problem- A sample of methane, CH4, gives off 24.9 joules of energy when combusted in the presence of excess O2, according to the equation CH4 + 2 O2 ---> CO2 + 2 H2O delta H = -802.4 kJ What is the mass of methane that was combusted
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