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A wildlife biologist is interested in testing the pH of the water in a lake. He obtains a 200mL sample of the water and titrates this sample with a 0.050 M NaOH solution. Neutralization of the lake water needs 40mL of the NaOH solution. If the size of the lake can be described as 1.1 km long by 2.3 km wide and has a depth of10m, approximate how many moles of acid are present in the lake water.
a) 10^8 molesb) 2.5 x 10^5 molesc) 2 x 10^-8 molesd) 2.5 x 10 ^-8 molese) 10
the melting point of water is 0.000c at 1 atmosphere. if 11.64 grams of chromiumii acetate 170.1 gmol are dissolved in
calorimeters, is -3226.7 kJ/mol. When 2.5127 g of benzoic acid was burned in a calorimeter, the temperature increased from 20.84 to 25.67C. What is the heat capacity of the bumb
A typical backyard swimming pool holds 150 yd^3 of water. What is the mass in pounds of the water?
Given K=6.45x10^5 for 2NO(g)+O2(g)=2NO(g) at 500K, what concentration of oxygen would be needed to maintain equilibrium in a system where NO and NO2 are known to be at equal concentrations.
that the density of all solutions is 1.00 g/mL, and the volumes are additive. calculate the q for the reaction and calculate q for the neutralization of one mole of NaOH
a sample of He gas has a volume of 900 mL and a pressure 2.50 atm at 298 K. What is the new pressure when the temperature is changed to 336 K and the volume is decreased to 450 mL?
calculate the PH at the points in the titration of 20.00 ml of 0.318M NH3 when, a) 10.00 ml and 15.00 ml of 0.475 M HCl have been added.
Determine the molality and molarity of the HCL, if the solution has a density of 1.20 g/ml.
If 5.00 mL of HCl require 4.78 mL of 0.9581 M NaOH to just consume the HCl, what is the concentration of the HCl
What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with Ka=3.5x10^-8. The equation for the dissociation of hypochlorous acid is: HOCl(aq)+H2O>>>H3O+(aq) + OCL-(aq)
A buffer consists of 0.20 M KHCO3 and 0.44 M K2CO3. Carbonic acid is a diprotic acid with Ka1 = 4.5 multiplied by 10-7 and Ka2 = 4.7 multiplied by 10-11. (a) Which Ka value is more important to this buffer
Compare the electron-dot of CH4 and H2O. Why do these molecules have similar bond angels but different names for their shapes
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