can acts a [x] and acid and [b] a pair of electr on 2 The reactions studied in t

Question

can acts a [x] and acid and [b] a pair of electr on 2 The reactions studied in this experiment obey the usual rules of stoichiometry. Consider the reaction: Mg(NO3)2(aq) + 2 NaOH(aq) Mg(OH)2(s) + 2 NaNO3(aq) To 2.0 mL of 0.10 M Mg(NO3)12 in a test tube, 3.0 M NaOH is added dropwise. Calculate the number of mmoles of Mg(NO3)2 in the solution. Note do not use scientific notation tion 3 To 2.0 mL. of 0.10 M Mg(NO3)2 in a test tube. 3.0 M NaoHlis added dropwise Calculate the volume in mL of NaOH which is needed to react completely with the Mg(NO3)2- stion 4

Explanation / Answer

Question 2:

Mg(NO3)2 and NaOH are in 1:2 ratio

We have 2 mL of 0.1 mol/L Mg(NO3)2 = 2 mL * 0.1mol/L = 0.2 millimoles of Mg(NO3)2 are present

Question 3:

0.2 milimoles Mg(NO3)2 require 0.2 * 2 = 0.4 millimoles of NaOH

Molarity of NaOH = 3.0 M = number of millimoles / number of mL of NaOH = 0.4 millimoles/ mL of NaOH

              Volume of NaOH required = 0.133 mL

cross verification:

V1N1 = V2N2

0.2 mL* (0.1 M * 2) = 0.133 mL * 3 M

0.4 = 0.399

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