Answer:
Back titration is a titration done in reverse; instead of titrating the original sample, a known excess of standard reagent is added to the solution, and the excess is titrated.
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Your answer to this question is 1.20 times 1024 atoms
<span>the elements in groups1a, 2a, 3a have positive charges according to their group numbers</span>
If I’m right this should be the answer
