Q27 (A). Describe/draw the formation of bond in the following compounds: (i) CaF2 (2 Marks)

(ii) Na2O (2 Marks)

(iii) SiH4 (1 Mark)

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.