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a) How many grams of sodium lactate should be added to 1.00L of 0.150 M lactic acid to form a buffer solution with pH = 4.10? Assume that no volume change occurs when the sodium lactate is added.
b) Calculate the percent ionization of 9.0×10-2M lactic acid in a solution containing 5.5×10-3 M sodium lactate.
How high must a waterfall be for the water to change temperature by 0.1K during its fall (assuming no evaporation)
25.00 mL of a tap water sample is titrated with5.00x10-3 M EDTA solution. 6.25 mL are required to reachthe endpoint. What is the hardness of the water in ppm
How many orbitals are there in a atom with the following combinations of quantum numbers? A). n=3 l=1 B). n=4 l=2 ml=2
suppose 45.0 g of water at 85 degree celcius is added to 105.0 g of ice at 0 degree celcius. the molar heat of fusion
under certain conditions the averagerate of appearance of oxygen gas in the reaction 2o3g --- 3o2gis .0012 atms-1. how
Is the energy that an electron has in the first energy level of atom A the same as the energy that an electron would have in the first energy level of aom B
How much heat is associated with the burning of 3.52 g of methane in the following unbalanced reaction: CH4(g) + O2(g) ?CO2(g) + H2O(g)
Prepare (2R,3S)-2,3-dibromobutane (a meso compound) starting from a racemic mixture of (2S,3S)- and (2R,3R)-2,3-dibromobutane
The rate constant of a reaction is 7.50*10-5 L/mol·s at 195°C and 5.30*10-3 L/mol·s at 258°C. What is the activation energy of the reaction, in kJ/mol
Find the percentage of FeCl2 in a 35.5g sample of ore which has been dissolved in aqueous acid and titrated to the endpoint with 23.55 ml of 0.309 M Cr2O7^2- . the molar mass of FeCl2 is 126.0 g/mol. Cr2O7^2- + Fe^2+ ------> Cr^3+ + Fe^3+
The combustion of 13.2 g of propane, C3H8 (g), liberates 6.6x10^3 kJ of heat. What is the enthalpy change (kJ) for the reaction?
What is the volume in mL of 0.664 M HCl(aq) needed to neutralize the hydroxide ions present in 32.2 mL of 0.851 M NaOH(aq).
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