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How much a 6M Na2CO3 stock solution do you need to make 100 ml of a 10% Na2CO3 working solution? Describe how you would make the same solution given a bottle of anhydrous soduim carbonate (MW=105.99g/mole). Show calculations.
Calculate the pH at the equivalence point for the titration of 0.10 M HCl with 0.10 M NH3 (Kb = 1.8 x 10-5).
A gas sample is connected to a closed end manometer. the difference in mercury levels in the two arms is 115mm. what is the gas pressure in torr if the atmospheric pressure is 750 torr
A beaker of salt water has some solid NaCl at the bottom. What type of solution is in the beaker
the absorption of ultraviolet light by rna in the near uv 250-300nm is due to electronic transitions within the bases.
Given the pK for acetic acid is 4.76. Suppose that we dissolve a mole of this weak acid in 10L of water. Find the pH of the resulting solution.
predict whether an aqueous solution of ammonium bicarbonate would be acidic, basic or netural. explain your answer, and support it with real data.
A red laser pointer emits light with a wavelength of 660. What is the frequency of this light? 2.What is the energy of one of these photons?
What is the formula for the compound formed between germanium with a valency of (IV) and iodine
Consider the following chemical equation. H2(g) + I2(g) ? HI(g) Assuming all gases are at the same temperature and pressure, how many milliliters of hydrogen iodide are produced from 725 mL of H2
A zero-order reaction has a constant rate of 1.50×10?4. If after 55.0 seconds the concentration has dropped to 4.50×10?2, what was the initial concentration?
There is a solution which includes [H+]=0.3M, [Fe+2]=0.05M and [Pb+2]=0.05M and that this solution is saturated with H2S (means you take value [H2S]= 0.1M)
If a wheelchair-marathon racer moving at 13.3 miles per hour expends energy at a rate of 635 Calories per hour, how much energy in Calories would be required to complete a marathon race (26.2 miles) at this pace
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