Question

EELT Ă Aa A E ADA AaBbCcDde AaBbCcDde AaBbci AaBbcc AaBbci AaBbCcDe 1 Normal 1 No Spac... Heading 1 Heading 2 Title Subtitle Paragraph Styles Part 1 Data and calculations: Determining the concentration of NaOH solution Trial 1 Trial 2 Trial 3 Trial 4 mass of acid (KHP) (6) 0.6206 0.6178 0.6137 0.6095 Final buret reading (ml) 21.07 41.27 20.54 40.72 Initial buret reading (mL) 0.33 21.07 0.38 / 20.54 Vol. NaOH used (ml) Molarity of NaOH (mol/L) b. Show one sample calculation for determining the molarity of NaOH (be sure to include the mole ratio in this calculation): c. Show your calculation for determining the agreement of your 3 closest trials (see step 9 on p. 5-4): d. Your calculation for determining the average of the 3 closest trials: e. Summary of NaOH calculations: agreement of your 3 closest trials Your average molarity Larch

Answer 1

4 Part 1: Dettomining the concentration 9 Naoel solution Trial Trall 2 Trail 3 Trail a mass of acid (KHP) () 0.6206 0.6178 0.6137 0.6095 Final bure te scading mulu) 21:07 41.27 20:54 40172 inftiul burete rcoding (W) 0.33 21.07 0.38 20.34 vol og Alaot used Gmi) v vg) 20.77 20:20 20-16 20:18 mlarity g Nanti (moell) 0.146 0.151 0.151 0.151 Reaction b/w kHP and Naoth can be worten as 2 KHGH or Naota - KNACH O Gait Hj. ó. Imole , KHP = 1 noleg Noon moles. o ktp = mass - 0.6206 g - 3.039x10 moles molar mass 204. 22 glmol. moles of KHP = moles of Naot = 3.039x10 moles Molarity y Nach = moles 3.039X10 mof -0.146 M. 20.77x10 - volume & solution CM © Agreement 13 closest toials. 0.151 +0.151 +0.151 - 3 (trail 2, 3 & 4) © Average mocarsty o NaOH = 0.159 M

23.18 23.12 24.36 Part 2: Detimination o melas mase 2 een known acya prial I Trial 2 Trial 3 Trial & mass of anknown acido 0.2101 0.2104 0.2123 0.2118 final buret reading (me) 23.53 47.89 23:41 46.46 Initial buret reading 23.53 0.23 23.41 0.41 vol. Alaot used (mi) 23.05 moles of NaOH 23.12X10 3-68X16 - 3:40 (molarity xvolume) = 3.49x103 Calculated molar 60.20 57.12 60.66 mass for unknown (g/mol) 6 0.86 ut us assume OKS mole y een known and mole NaOH goom 1:1 ratio. - moles NaOH = moles y anknoon acid = 3.49 x10 moles molas Mass for an Crown - Mass moles - 0.2101 9 = 60.20 gmot! 3.49x173 mol © Agreement blw three closett hals are poa! 1,34 @ i 3.49x163, 3.50 x103 and 3.48x103 @ Average molar mass goom 3 closet foals (60.20 + 60.66 + 60.867 g moet = 60.57 gmott Average molar mass of unknown = 60.5t gmont