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Question: The electrode of a pH meter is placed in a sample of urine and a reading of 7.9 is obtained. Is the sample acidic basic, or neutral? What is the concentration of H3O+ in the urine sample??
Calculate the minimum amount of dichloromethnae required to extract 99% of the 60 mg of caffeine dissolved in 50mL of tea in one extraction.
What volume of .2 M Na2SO4 will completely react with 50 mL of .135 M Ba(NO3)2
What are the steps needed in order to calculate the molar mass when given a freezing point depression. Please be as specific as possible.
What was the molarity of the KOH solution if 23.2ml of 1.50 M H2SO4 was needed? The equation is 2KOH(aq) + H2SO4(aq)----->K2SO4(aq) + 2H2O(l)
Ammonia can be made by reacting calcium cyanamide (CaCN2) with water as shown: CaCN2 + 3 H2O => CaCO3 + 2 NH3.
how many milliliters of h2o vapor measured at 291. degc and 724. torr are formed when 49.0 ml of nh3 at 815. torr and
Kc for the reaction below at 25°C is 4.8 x 10-6. Calculate the equilibrium concentration (mol/L) of Cl2(g) if the initial concentration of ICl(g) is 1.33 mol/L. There is no I2 or Cl2 initially present.
Use values of ksp and kf for copper (II) hydroxide and its complex to predict if a precipitate should form in a 0.1 M Cu2+ solution that is 3M in OH-
water consistent with this oversimplified approach? Explain your answer ( note that there is a threshold temperature below which this approach will have a significant error)
Calculate the partial pressure of each gas and the total pressure after the valve between the flasks is opened. P(He) in mmHg P(Ar) in mm Hg Ptotal in mm Hg
How could you determine (without tasting) whether a container of a colorless liquid contained ethanol or ethanol and sucrose
One beaker contains 10.0 mL of acetic acid/sodium acetate buffer at maximum buffer capacity (equal concentrations of acetic acid and sodium acetate), and another contains 10.0 mL of pure water.
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