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A student dilutes a solution of 0.100 mol of H3PO4 and 0.150 mol of NaOH with water to a volume of 1.00 L but then realizes that the "distilled water" used was in fact dilute hydrochloric acid.
a)If the pH of the final solution is 6.50, what are the concentrations of H3PO4, H2PO4^-, and HPO4^2-?
b)How many moles of HCl were inadvertently added to the original solution?
Compute the change in temperature when 2 g of sodium chloride is dissolved in 270.0 mL of water initially at 25 C. The heat capacity of water is 4.184 J/mL/K. Neglect the heat capacity of the NaCl.
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A 1.9l L flask at 17degree c contains a mixture of N2, He,and Ne at partial prassuer of 0.261 atm for N2 is 0.195 atm for He ,0.397 for Ne. Calculat the volume at STP occupied by He and Ne, if N2 is removed
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