What additional volume of 10.0 m hcl would be needed to exhaust the remaining capacity of the buffer after the reaction described in part b? express your answer in milliliters using two significant figures?

A buffer of pH = 7.79 is prepared using Tris HCl and NaOH. Moles of Tris HCl = 31.52 g x (1 mole / 157.59 g) = 0.20 moles.

Moles of NaOH = Molarity x volume = 10.0 M x 6.7 mL / 10^3 L = 0.067 moles

Tris – HCl + OH^- -> Tris + H_2O + Cl^-

Setup the reaction table as follows :

Tris – HCl + OH^- -> Tris + H_2O + Cl^-

0.200           0.067                                            Initial

-0.067          -0.067    +0.067                            Change

0.1333         0              0.067                            Final

 

The buffer is diluted to ! L and half the solution is taken. So half the moles of tris – HCl and tris are present.

Moles of Tris – HCl = 0.133 / 2 = 0.0665 moles

Moles of tris = 0/067 / 2 0.0335 moles

 

To this solution, 0.0150 mol of H+ are added. H+ reacts with tris giving Tris – HCl. So moles of tris – HCl = 0.0665 + 0.0150 = 0.0815 moles

Moles of tris = 0.0335 – 0.015 = 0.018 moles

 

When all the 0.018 moles of Tris are consumed, the remaining capacity of the buffer is exhausted.

So moles of HCl to be added = 0.018 moles.

Volume of Hcl = moles /molarity = 0.018 moles / 10.0 M = 0.0018 L = 1.8 mL

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?  

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy