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Based on the formulas of the following solutes, which compound would have the largest van't Hoff factor (i)
Rubidium-87 decays by beta decay with a half-life of 4.9 x 10^10 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour
it was important that the flask be completly dry before the unknown liquid was added so that water present would not vaporize when the flask was heated.atypical single drop of liquid water has a vol
A solution gave a precipitate when ammonium oxalate was added but gave no precipitate when ammonium sulfate was added. For each Magnesium group ion(Barium, Magnesium, Strontium, and Calcium) tell wh
A rechargeable battery is constructed based on a concentration cell constructed of two half-cells. The volume of each half-cell is 2.1 and the concentrations of in the half-cells are 1.30 and 1.2&ti
the pressure of the vapor in this experment when the flask was full of vapor was assumed to be equal to the pressure of the atmosphere in the laboratory. why is this assumption valid
two mwthods were described for determining the volume of the flask used for the molar mass determination.
It is important that the flask used for molar mass determination is completly dry before adding volatile liquid unknown to it.why? what would happen to any droplets of wash-water remaining in the fl
What would the atom ratio of 206Pb to238U be in a uranium mineral from a rock that is 1.0 × 10^9 years old? t1/2(238U)= 4.5 × 10^9 yr
why is vapor unlikly to behave as an ideal gas near the temperature at which the vapor would liquefy
A 2.983 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.910 grams of KI and 50.
Have you ever wondered about how a frost-free refrigerator remains, well, frost-free? The key is sublimation During certain times, the freezer compartment is warmed slightly
What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29.80 mL of 0. 3567 M NaOH? Ka =1.8 × 10-4 for formic acid.
A solution contains 2.2 × 10-3 M in Cu2+ and 0.33 M in LiCN. If the Kf for Cu(CN)42- is 1.0 × 1025, how much copper ion remains at equilibrium
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 50.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.
Which of the following acids (listed with pKa values) and their conjugate base would form a buffer with a pH of 8.10
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10-5.
When a gas is collected by displacement of water,the gas often appears foggy as it is generated. what it means to say that a gas collected by this technique is saturated with water vapor.
The solubility of which one of the following compounds will increase if the pH of a saturated solution of the compound is lowered
when oxygen is in use in hospital room,no smoking signs are usually posted prominently. Explain.
What is the pH of a solution that contains 0.50 M H2CO3 and 0.50 M NaHCO3? (Ka1 = 4.3 X 10-7, Ka2= 5.6 X 10-11)
What would be the best indicator for the titration of 0.20 M CH3COOH titrated with 0.2 M NaOH? (Ka for acetic acid = 1.8 X 10-5) The pH ranges for the color change of some common acid base indicator
How many moles of silver metal are produced in 1.2 hours by the electrolysis of AgNO3(aq) using a current of 6.0 A