Calibration of a glass electrode gave a reading of 128.9 mv with saturated potassium hydrogen tartrate buffer standard (ph = 3.557) and a reading of -98.8 mv with 0.008695 potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (ph = 7.400), both measured at 30°c.
(a) what is the observed slope (mv/ph unit) of the calibration curve?
(b) what is the theoretical slope at 30°c?
(c) what is β, the electromotive efficiency to three significant figures? ? open the hint panel below for the definition of electromotive efficiency.
(d) what is the ph of an unknown that gives a reading of 24.0 mv with this electrode at 30°c?

idk

explanation:

dasdad

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole