7. What is the activity coefficient of the magnesium ion (Mg") if it is in a salt solution with an ionic strength of 0.05 M 8. Draw a block diagram of a single beam UV-Vis absorption spectrophotometer. 9. Which of the following titrations/titration curve will have a buffer region. (circle all answers that apply) a) Strong acid by a strong base b) Weak acid by a strong base c) Strong base by a strong acid d) Weak base by a strong acid e) Diprotic acid by a strong base f) Triprotic acid by a strong base 10. Label 6 of the regions of the electromagnetic spectrum (pay attention to scale of the two different axes). (infrared, visible, x-ray, radio, gamma, UV, microwave) frequency (Hz) 1019 10"7 10" 10 1011 10" H 10-10 10* 10* 10* 102 10 wavelength (m) 11. Which has sharper peaks (narrower peaks), atomic absorption spectra or molecular absorption spectra? Briefly explain why there is a difference.