Ka of a weak acid HX is 6.72 × 10–7. During a titration, an analyte solution containing a mixture of [HX] and [X–] has the ratio of [X–]/[HX] = 1.75. What is the pH of the analyte solution? Assume the solution is in its buffering region, where pH of the solution can be approximated by: pH = pKa + log([X–]/[HX])

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

they are all solids.

може ли да зареждате повече информация, моля