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Determine the pH at the equivalence (stoichiometric) point in the titration of 31.4 mL of 0.899 M HF by 0.886 M NaOH. The Ka of HF is 3.5 x 10^-4.
What is the pH of a buffer prepared by adding 0.506 mol of the weak acid HA to 0.507 mol of NaA in 2.00L of solution? The dissociation constant Ka of Ha is 5.66 x 10^-7.
Calculate the ph of the solution made by adding 0.50mol of HOBr and 0.30 mol of KOBr to 1.00 L of water. The value of Ka for HOBr is 2.0 x 10^-9.
Please complete and balance the molecular equation and write a net ionic equation, make sure to include the physical states of the compounds, if there is not reaction write NR for the products.
A buffer is prepared by mixing 328 mL of 0.348 M HCl with 813 mL of 0.803 M ammonia (NH3). Given that the Kb of NH3 is 1.8 x 10-5, calculate the pH of the solution.
Calculate the pH when 8.14 g of NaClO is added to 445.5 mL of 0.50 M HClO. Ignore any changes in volume.
What are all the sterioisomers of CHDCl-CH2-CHDBr What are all the sterioisomers of BrCHDCHDBr
Calculate the hydroxide ion concentration in a solution that is 0.068 M morphine C17H19O3N and 0.045 M morphine hydrochloride C17H20O3NCl. Kb of C17H19O3N is 1.6 x 10^-6
If a system has 3.50 × 102 kcal of work done to it, and releases 5.00 × 102 kJ of heat into its surroundings, what is the change in internal energy of the system
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 9.70 MJ of energy (in the form of heat) if the temperature of the sodium is not
barium acetate + iron (II) sulfate a) molecular equation; b) net ionic equation: 3. magnesium hydroxide + chloric acid a) molecular equation: b) net ionic equation:
Estimate the time it will take to flush 99% of the discharge from the lake. Immediately after the spill, the lake, completely mixed, has a pH of 8 and the total molar concentration of nitrogen speci
If you have 410.0 mL of water at 25.00 °C and add 140.0 mL of water at 95.00 °C, what is the final temperature of the mixture. Use 1.00 g/mL as the density of water.
Stretched rubber band Touch the relaxed rubber band briefly to your upper lip. Quickly stretch your rubber band and immediately touch the stretched rubber band to your upper lip again
the reaction: 2C2H6(g) + 7O2(g)-----> 4CO2(g) + 6H2O(g) is exothermic. predict under what conditions of temperature (low, high, all or none) the reaction is expected to be spontaneous
The activity of the antibiotic penicillin slowly decomposes when stored in a buffer at pH 7.0, 298K. The time dependence of the penicillin antibiotic activity
Magnesium is used in lightweight alloys for airplane bodies and other structures. The metal is obtained from seawater in a process that includes precipitation, neutralization, evaporation, and elect
An electrical heater delivers 7.880 kJ of energy (as heat) to a system consisting of the gas inside a cylinder having a movable piston. As a result, the piston moves against a constant external pres
The specific heat capacity of mercury at 25°C is 1.400×10^-1 J/g/K. For a 8.25×10^2 g sample of mercury, how much energy is required to raise the temperature from 22.4°C to 29.4&
Carbon dioxide is removed from the atmosphere of space capsules by reaction with a solid metal hydroxide. Theproducts are water and the metal carbonate
A lake has a pH of 8 and the total molar concentration of nitrogen species (NH3 and NH4+) is 7.1×10-4 mol/L. what is the percentage of aqueous NH3 in the lake
In a titration of HNO3, you add a few drops of phenolphthalein indicator to 50.00 mL acid in a flask. You quickly add 20.00 mL of 0.0414 M NaOH but overshoot the end point, and the solution turns de
The pH of 0.5 M HF is 1.88. Calculate the difference in pH when 6.06 g of NaF is added to 205.7 mL of this solution. Ignore any changes in volume. The Ka value for HF is 3.5 x 10-4.
Based on the values of the standard reduction potentials, predict what happens when adding and write the relevant equations. copper to a 1 M solution of nitric acid zinc to a 1 M solution copper to
A buffer is prepared by mixing 303 mL of 0.146 M HCl with 923 mL of 0.565 M sodium acetate (NaCH3COO). Given that the Ka of acetic acid is 1.8 x 10-5, calculate the pH of the solution.