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Question- 1) Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).
2) Calculate the change in pH when 6.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.Compute the correct values
The percent composition (by mass) of a compound is 40.0% carbon, 53.0 % oxygen and the rest is hydrogen. Find the empirical formula of the compound.
Calculate the mass of propylene glycol that must be added to 0.500 kg of water to reduce the vapor pressure by 4.60 torr at 40 degrees celcius.
Pure olive oil has an iodine value of about 85. A very old sample or originally pure olive oil is found to have an iodine value of 55. Explain
The unknown liquid is volatile. If some of the liquid evaporates between the time the liquid is delivered to the beaker and the time its mass is measured, will the reported density of the liquid be too high, too low, or unaffected. Explain
The pH of lemonade is approximately 3.0. How many times greater is the [H+] in coffee than in tap water having a pH of 8.0
Chlorine was passed over 1.30 g of heated titanium, and 4.20 g of a chloride-containing compound of Ti was obtained. What is the empirical formula of the chloride-containing compound
Evaluate the z-component of the angular momentum and the kinetic energy of a particle on a ring that is described by the (unnormalized) wavefunctions e^iΦ ,e^-2iΦ ,cosΦ ,(cosφ)e^iΦ , (sinφ)e^-iΦ
The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of the non-volatile solute in the solution?
It took 49sec for 1.0 L of helium to effuse through a pin hole. Explain How long will it take for 1.0 L of methane CH4, to effuse under identical conditions
As you near the end point of a titration water is added from a wash bottle to the conical flask .Explain the effect if any,on the titre. why are concordant result used to calculate the mean titre
a 0.0587g sample of gas with an empirical formula chf2 is placed in 154 ml flask. it has a pressure of 46.3 mmhg and
An organic pesticide (MW 183.7) is 8.43% Cl. A 0.627 g sample containing the pesticide plus inert material containing no chloride was decomposed with metallic sodium in alcohol.
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