Question

Analysis of Satwater UNKNOWN # D. Concentration of Sodium Chloride in Saltwater mL La mL. volume of saltwater solution 83.6708 4.922 mass of evaporating dish + solution (before heating) 22. ldA& 44.995 2.923 41.224 mass of evaporating dish mass of saltwater solution 77.8618 mass of evaporating dish + NaCl solute (after heating) 0.1978 3.7 RECYCLE Chemical Waste mass of NaCI solute Show the calculation for percent concentration of NaCl for trial 1 (see Example Exercise 1). .74 100 3.28/ 6.00las 3.7719 =D.V (00- 125.9% 2.4339 12S.9 3.2 8 Mass/mass percent concentration of NaCl Show the calculation for molar concentration of NaCl for trial 1 (see Example Exercise 2). 0.197 Nac mL Soluto molWacc S2.449 .337 mNact 3.771g Imal х .453 m Nacl X IL ( mL 337 M lo.453 M Molarity of NaC &39 м Average molarity of NaCl

Did I do the math right with the data I collected? Or is trial 2 supposed to be negative?

Answer 1

The math which you have done is almost correct.Well done.I have done the calculation correctly.please see.

6. 0062 Pereent concentration of nach 854) = 0.192.9 x100 % = 3.280) Percent concentration of Naelland) = 3.771 g x100°r. 2.9339 .. 128.57°/- Mass/mass Pereent Concentration of Nael = 3.28% 128.57% Molas Concentration of NaCl (15+) = 0.1979 Nael x 1 mol Nael x 1000m2 2 0.337 m Nael 10 ml slution 58.449 IL Molas Concentration Of Naelland) 2 3.7719 Nacl & Imol x 1000m – 6.453 M Nach 10 ml solution 58.449 0 molatity of Nael 0.337M 6.453 ni 1 Average molarity 3395 m Log Nael O -