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Problem- A potassium dichromate is prepared by 0.3525 grams of K2Cr2O7 is enough water to yield 250.0 mL of solution. A student then measures 10.00 mL of an unknown solution of Fe2+ into an Erlenmeyer flask and dilutes with 90 mL of 1.0 M hydrochloric acid. He then titrates this sample with the soultion prepared above. If 38.40 mL of the potassium dichromate solution is needed to reach the end point, what is the concentration of Fe2+ in the original unknown solution?
If possible just a brief explanation how you got the answer?
A 135 mL sample of a 15.0 M ethylene glycol (rm C_2H_6O_2) solution is diluted to 1.50 L.What is the freezing point of the final solution.
Using the average initial pH of your acetic acid solutions, and the average molarity of those solutions, calculate a value of Ka for acetic acid. when initial pH is 2.63 and average molarity is 0.06475.
Describe how you will prepare the 1.00 x 10-3 M phosphate solution using the phosphate stock solution provided (1.00 x 10-1 M) to create a 200 mL of 1.00 x 10-3 M phosphate solution.
What mass of sodium phosphate would have to be added to 2.0 of this solution to completely eliminate the hard water ions? Assume complete reaction.
Calculate the molarity of a solution made by dissolving 0.750 grams of Na2SO4 in enough water to form exactly 850mL of solution. How many moles of KMnO4 are present in 250mL of a 0.0475 M solution
Give the balanced chemical equation, the ionic equation and the net ionic equation for the production of barium sulfate from aluminum sulfate and barium nitrate.
The gasoline tank of an automobile contains 83 kg of gasoline. The gasoline combines with 332.0 kg of oxygen. What is the total combined mass of the carbon dioxide and water produced by combustion in the engine
A hydrate of calcium sulfate CaSO4.XH2O contains 20% water. calculate the ater of crystallization (X), and write the formula of the hydrate
How to calculate the ratio of the masses of the buffer components required to make the buffer. m(NH3) / m(NH4Cl) ph= 9.00
the calculated H neutzn be higher, lower, or the same as the literature H neutzn? briefly explain this difference as a result of using only one graduated cylinder for the experiment
8.00×10^-3mol of HBr are dissolved in water to make 14.0L of solution. What is the concentration of hydroxide ions,[OH-] , in this solution and 4.00g of NaOH are dissolved in water to make 2.00L of solution. What is the concentration of hydronium ..
Naphthalene normally freezes at 80.2 degrees C and has a Kf value of 6.9 C/m. A solution containing 1.19 g of sulfer dissolved in 10.20 g of naphthalene freezes at 77.1 degrees C. Calculate the molality of the solution and the molar mass of the so..
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