Whrt volume in mi, of 2.858 M NaCl solution contain O.57a mol NaCr? QUESTION 2 H
ID: 493074 • Letter: W
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Whrt volume in mi, of 2.858 M NaCl solution contain O.57a mol NaCr? QUESTION 2 How moles of NaOH me in 166 mL of4BM M NaOH? QUESTION 3 Select the precipitate that form when aqueous lead00 nitrate reacts with aqueous sodum sulfate. NaNO3 QUESTION 4 This is question 4.47d from McMurry and Fay6thediton. Predict whether a precipitation reaction will occur when aqueous solutions of BaNO312 KOH are mixed Precipitation reaction wil occur Precipitation reaction wil not occur QUESTION 5 identify all the spectator ions in the following reaction. and so?-Explanation / Answer
Q1) molarity is defined as the numbe rof moles of solute in 1L of solution.
thus the solution with molarity 2.656 M has
2.656moles in 1 L of solution
0.578 moles in
= 0.578moles x1L /2.656mol
= 0.2176 L
= 217.6mL
Q2) similarly 1 L of solution has molarity 4.94 M
That is
1L=1000mL solution contains 4.94 moles of NaOH
166mL of solution can have
= 166mL x 4.94moles/ 1000mL
= 0.82 moles
Q3)The reaction is Na2SO4 (aq) + Pb(NO3)2 (aq) ----------> 2NaNO3(aq) + PbSO4(s)
Theus the precipitate is PbSO4
q4) no precipitation occurs
Ba(NO3)2 (aq) + 2KOH (aq) -------------> K(NO3)2(aq) + Ba(OH)2 (aq)
Q5) K+ and So4-2 re the spectator ions as heir oxidation number does not change during the reaction.
Q6) Na2O is sodium monoxide
Q7) OF2 is oxygen difluoride
Q8) Reducing agent undergoes self oxidation , thus loses elecrons. True
Q9) An oxidizing agent undergoes reduction, thus gains electrons.
False
Q10)and 11) In S2O3-2 .
oxidation state of s is +2 and O is -2
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