25 cm^3 of 0.010 moldm^-3 chloroethanoic acid (CH2CICOOH) is added to a conical task. Which of the following answers gives the correct pH value for the solution
(Ka (CH2CICOOH) = 1.3 x 10^-3 moldm^-3)?

a) 2.84
b) 4.89
c) 6.28
d) 2.44

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.