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Although the viscosity varies over a factor of more than two in the series from hexane to nonane, the surface tension at at 25 degrees Celsius increases by only about 20% in the same series. How do you account for this?
The equation for the reaction is CaCO3(s) + 2HCl(aq) arrow CaCl2(aq) +H2O(l) +CO2(g) The excess HCL (aq) is titrated by 6.45 mL of 0.125 M NaOH(aq). Calculate the mass percentaageof CaCO3(s) in the sample.
sodium chloride dissolved in 225 g of water has a density of 1.98g/ml. Calculate the molarity of sodium chloride.
The equation for the Beers Law- A= -log10 I/Io. Tell what each variable represents.
The water level in a graduated cylinder initially at 211 rises to 282 after a piece of lead is submerged. What is the mass in grams of the lead.
The pH of a 0.010 mol L-1 solution of a weak monoprotic acid is 2.09 at 25oC. What is the pKa for this acid
In a titration experiment, 50.0 mL of 0.375 M HI solution is required to neutralize 35.0 mL of Ca(OH)2 solution. What is the concentration of the Ca(OH)2 solution?
What is the pH of a buffer solution made by mixing 150mL of 0.200 M acetic acid and 150 mL of 0.100 M sodium acetate
A 0.160 g sample of rock was found to have 2.11 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.11 × 10-6 mol of argon-40. How old was the rock? (What assumption is made about the origin of the argon-40?)
How many mmoles of mercury are in the sample? B) How many mg's of mercury are in the sample? C)What is the percent mercury (w/w) in the ointment?
What role do the potassium chloride (KCl) and potassium sulfate (K2SO4) play in this experiment
A titration experiment is set up to use .235M bleach (NaOCl) to analyze CrO2^-. If 50mL of the CrO2^-(aq) solution required 28.62mL of bleach to react to completion, what would you calculate as the molarity of the CrO2- solution
from the experimental data we obtain i- directly. to obtain ksp for pbi2 we must calculate pb2 in each equilibrium
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