(a) Describe how you would prepare 1.00 L of 0.120 M NaOH from a 1.20 M NaOH solution. (b) Describe how you would prepare the following aqueous solutions: (i) 200 ppm of Na using NaOH, (ii) 100 ppb of...

(a) Describe how you would prepare 1.00 L of 0.120 M NaOH from a 1.20 M NaOH

solution.
(b) Describe how you would prepare the following aqueous solutions:
(i) 200 ppm of Na using NaOH,
(ii) 100 ppb of Cl using CaCl2,

(iii) 0.1% (w/w) of Al using Al(NO3)3, and
(iv) 0.50 m CaCl2.