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Calculate the alkaline strength of a sample of impure K2CO3 in terms of per cent K2O from the following data: Wt. of sample=1.000g; HCl used= 55.90mL; NaOH used=0.42mL; 1.000mL NaOH=0.008473g KHC2O4•H2C2O4•2H2O; 1.000mL HCl=2.500mL NaOH.
The midpoints of the three pH jumps occurred at 15.35 mL, 19,77 mL, and 22.05 mL of added base. What was the concentration, in mol/L and mg/L, of Cu^2+ and Zn^2+ in the original solution
Compare in your mind 3 different liquids: pure ethanol, a 50% ethanol/water mixture and a 50 % ethanol/methanol mixture. Rank these three liquids in order of increasing Ptotal when each liquid is in equilibrium with its vapor at 25ºC.
A solution is made with 100mL of DI water and 8mL of .10 HCL (hydrochloric acid). then 2.50mL of NaOH is added. What is the new pH?
A 10-L drum of ether at 18C is open to the atmosphere (p=760 Torr) and contains 6-L of liquid. The top is sealed and the drum dented so that it now has an 8-L capacity.If the vapor pressure of the ether at 18C is 400 Torr, What is the pressure ins..
An adult female who weighs 164 pounds consumes on average 2470 Cal/day. If she wanted to lose 5.00 pounds in 293 days, what should her daily caloric intake
The resulting solution required 13.73 mL of 0.176 mol L-1 NaOH(aq) to neutralize the excess, unreacted HCl. What was the percentage by mass of Mg(OH)2 in the original sample [Hint: When Mg(OH)2 or Al(OH)3 reacts with HCl(aq), the products are a ch..
Calculate the final temperature after the two substances are mixed together. The specific heat of water is 4.184 J/ g *c and the specific heat for silicon is 0.7121 J/ g*c.
An "A" group metal (M) reacts with chlorine and oxygen to form ionic compounds with the formulas MCl4 and MO2. Propose a possible identity for the metal M. Explain your reasoning.
suppose 2.8 moles of methane are allowed to react with 5 moles of oxygen? what is the limiting reagent?How many moles of CO2 can be made from this mixture? How many grams of CO2 would produce?
How many grams of NaOH are contained in 230.0 mL of a 0.800 M sodium hydroxide solution?
The enzyme, carbonic anhydrase, is a large zinc-containing protein with a molar mass of 3.00 × 104 g/mol. Zn is 0.218% by mass of the protein.
gold bars are plated from an aqueous solution of gold chloride (AuCl3) by using a current of 50 Amperes. With this current, how long would it take to plate out a 1 pound bar of gold worth almost $ 25,000? 453.59 grams weigh a pound.
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