General Chemistry Answers

What is the molar mass of Ferric ferrocyanide, Fe₄[Fe(CN)₆]₃?

How do you explain the volume of liquid remaining when the egg was removed from the distilled?

How many grams of H₂O are needed to react with 3250 g CO? 

an atom containing 8 protons 8 neutrons and 10 electrons

Calculate the mass in grams of 2 water molecules.

30.0g sodium sulfate into 300 ML of water

Hi.

Question 1.

Dissolution of limestone and for the dissociation of bicarbonate ion to carbonate ion as follows:

CaCO₃(s) −) = Ca²⁺ + CO^2-₃ K = 10^−8.3

HCO⁻₃ = H⁺ + CO^2-₃ K = 10^−10.33

Attains equilibrium in a solution at pH 9.33 that contains 10⁻² mol/L CaCO₃(s) and 10^−3.3 mol/L Ca²⁺.

(a) What is the HCO^–₃ concentration in the solution, assuming that activity coefficients for all species are 1.0?

(b) Would you expect the Ca²⁺ concentration to increase, decrease, or not change if the system changed in the following ways? For this part of the problem, do not assume that activity coefficients are 1.0. In each case, explain your reasoning briefly (1-2 sentences). For this part of the question, consider only the effect on the first reaction shown above.

(i) The concentration of CaCO₃(s) is doubled.

(ii) The ionic strength of the solution increases, e.g., by addition of NaCl.

(iii) The pH is lowered slightly, without significantly altering the ionic strength.

An atom of xenon has a radius 

r

Xe

=108.

pm

and an average speed in the gas phase at25

°C

of137

.⁢/

m

s

.Suppose the speed of a xenon atom at 

25

°C

has been measured to within1.0

%

. Calculate the smallest possible length of box inside of which the atom could be known to be located with certainty.