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An acid-base equilibrium system is created by disolving 0.10 mol HF in water to a volume of 1.0 L. What is teh effect of adding 0.050 mole F-(aq) to this solution?
a. the pH of the solution with decrease?
b. Some F-(aq) will react with H3O+ increasing the concentration of HF(aq) and reestablishing the solution equilibrium.
c. The addition of F- (aq) will have no effect on the pH or the concentration of HF(aq)
d. Some HF (aq) will ionize, increasing the concentration of F-(aq) and decreasing the pH.
e. Some HF(aq) will ionoze, increasing the concentration of F-(aq) and increasing the pH.
A 28.7 g sample of ethylene glycol, a car radiator coolant, loses 676 J of heat. What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol = 2.42 J/gK)? =°C
What mass of CCl2F2 must evaporate in order to freeze 115 g of water initially at 21 C? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/g *K .)
What molarity of aqueous aluminum sulfate solution can be expected to show the same conductivity as 0.030 M CaSO4 at 20,000 units?
a new element has been added to the periodic table. its atomic number is 119. what is its mass in comparison to other elements, what are some properties of this new element, and what would be the elements atomic radius.
If 545 mL of oxygen gas is collected at 21ºC and 754 mm Hg, what is its volume at STP?
Tyrosine was loaded onto an anion-exchange column and completely washed with a pH 6.5 buffer. Which amino acid came off the column first? A) Arg B) Lys C) Tyr D) His E) None, all would be retained on the column at pH 6.5
Explain in terms of their structures why each of the following pairs of substances have very different chemical and physical properties (a) Silica and carbon dioxide (b) oxygen and sulfur
Estimate the temperature at which calcium carbonate is likely to decomp under 1atm of pressure. Reaction: CaCO3(s) -> CaO(s) + CO2 (g) For this rxn: dHstandard = 177.8 kJ and dS standard= 160.5 J/K (notice unit differences)
what is the sum of ALL the coefficients in the equation?
What is the radius of the cross section of a cylinder that has a volume of 644.0 m3 and a height of 12.6 m? (Volume=πr2×height)?
Phosphorous acid, is an important compound in industry and agriculture, H3PO3(aq), is a diprotic oxyacid .determine the pH for each of the following points in the titration of 50.0 mL of a 1.5 M H3PO3(aq) with 1.5 M KOH(aq).
100 moles of water at 70 degrees celsius is brought into thermal contact with 100 moles of a monatomic gas at 20 degrees celsius, and the two substances exchange heat until they reach the same temperature. Assuming that no heat is lost to the surr..
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