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(a) What is the pH of this buffer? (b) What is the pH of the buffer after the addition of 0.48 mol of NaOH? (assume no volume change) (c) What is the pH of the original buffer after the addition of 0.23 mol of HI? (assume no volume change)
Calculate the pH of a solution conposed of 0.0831M ammonia (NH3) and 0.113M ammonium chloride (NH4Cl).
The solution has a density of 1.286 g/cm3. Calculate E for the cell. Assume all the H+ ions come from the first dissociation of H2SO4, which is complete.
Correct the absorbance of the spiked samples for dilution and plot the absorbance versus ppm Fe added. Extrapolate the graph to the point where absorbance is equal to zero to determine the amount of Fe in the cat food sample in ppm.
What mass of carbon dioxide can 1.00 kg of lithium hydroxide absorb?
Describe how you would prepare 500mL of a single solution containing 250mM Tris, 50mM glucose, and 5mM NaCl.
A certain protein was found to contain 0.412% manganese by mass. Determine the minimum molecular mass of the protein.
The synthesis of Amyl acetate by alcohol and anhydride, there are some chemicals be provided: Potassium carbonate, Calcium carbonate, Sodium sulfate
Small helium-neon lasers emit 4.62 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
How many calories of heat are necessary to raise the temperature of 350 ml of water from 1.00oC to 5.00oC.
Atoms contain protons. 2)Nuclei move out of the paths of the alpha particles. 3)Neutrons have zero charge.
A 20 degrees Celsius, the solubility of potassium nitrate is 30g in 100g of water. A 35 gram solution of potassium nitrate in water was determined to contain 10 grams of KNO3.
An analysis shows that 2.97 g of iron metal combines with oxygen to form 4.25 g of an oxide of iron. What is the empirical formula of the compound?
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