10 micrograms of co2 ion are there in one spot for 6 g co2 per liter and 10 microliters of solution.
the volume used for 1cm spot in diameter is 10microlitres
the concentration of cobalt nitrate solution is given to be 6g.
it means in each litre of solution there is 6 gram of cobalt (II) ions
1L = 10^6 microlitres
hence we co2 can say that in each 10^6litres there are 6g of cobalt(II) ions
in each microlitre = 1/10^6g cobalt (II) ions
so mass of cobalt(II) ions in 10 microlitres will be = 10*(1/10^6g)
= 10^-5g
= 10 micrograms
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