13. Each response below lists an ion by name and by chemical symbol or formula.

Question

13. Each response below lists an ion by name and by chemical symbol or formula. Also each ion is classified as monoatomic or polyatomic and as a cation or anion. Which response contains polyatomic polyatomic polyatomic an error? a) phosphate b) sulfite c) nitrite d) iron (II) e) bromide PO43 SO32 NO3 Fe2+ anion anion anion monoatomic cation monoatomic anion 14. You have a stock solution of 3.49 M NaCI. How many mL of stock solution are needed to make 200 ml of 0.450 M NaCI? a) 0.388 mL b) 25.8 mL c) 0.068 L d) 1550 mL

Explanation / Answer

Answer:

13) a) Phosphate-PO4^3- is polyatomic because it contains Phosphorus and oxygen and it is anion.

b) Supfite-SO3^2- is also polyatomic because it contains bother sulphur and oxygen and it is anion.

c) Nitrite-NO2^- not NO3^- (nitrate) this is the error. It is also polyatomic and anion but representation is wrong.

d) Iron(II)-Fe^+2 is monoatomic cation.

e) Bromide -Br^- is monoatomic anion.

So option C has error.

14) Here we will use dilution law M1V1=M2V2

Given M1=3.49 M, V1=?, M2=0.45 M and V2=200 mL.

M1V1 = M2V2

(3.49 M)V1=(0.45Mx200 mL)

V1=25.78 mL~25.8 mL.

So option B is correct.

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