You prepared a 0.250 M NH, solution by diluting 8.46 (±0.04) mL of 28.0 (10.5) wt% NH, [density = 0.899 (±0.003) g/mL] up to 500.0 (+0.2) mL. Find the uncertainty in 0.250 M. The molecular mass of NH3, 17.031 g/mol, has negligible uncertainty relative to other uncertainties in this problem.
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![EXAMPLE Significant Figures in Laboratory Work
You prepared a 0.250 M NH, solution by diluting 8.46 (0.04) mL of 28.0 (10.5) wt%
NH, [density=0.899 (+0.003) g/mL] up to 500.0 (+0.2) mL. Find the uncertainty in
0.250 M. The molecular mass of NH3, 17.031 g/mol, has negligible uncertainty relative to
other uncertainties in this problem.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa9ee1bf6-9240-46e4-9fcb-8739e030ba0d%2F2cc3398b-7ef3-4a36-a5b7-ca3cfd95a4cd%2Fzq0pmpp_processed.jpeg&w=3840&q=75)
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- 1. How many milliliters of 53.40(±0.06) (w/w) % NaOH with a density of 1.52(±0.01)g/mL will you need to prepare 1.000 L of 0.200 M NaOH? Keep 1 extra sig fig in your answer (4). 2. If the uncertainty in delivering NaOH is ±0.01 mL, calculate the absolute uncertainty in molarity (0.200 M). Assume there is negligible uncertainty in the formula mass of NaOH and in the final volume (1.000 L) Hint: You will need to calculate the molarity of the 53.40% NaOH. One way to solve this is to assume that you have 100.00 grams of the initial NaOH solution. Determine how many grams are NaOH. Convert that value to moles NaOH. Using the density, determine the volume of your 100.00 grams of solution.Q3/ A) 0.63 g of a sample containing Na,CO3, NaHCO, and inert impurities is titrated with 0.2 M HCI, requiring 17.2 mL to reach the phenolphthalein end point and a total of 43.5 mL to reach the modified methyl orange end point, How many grams NazCO3 and NaHCO, are in the mixture?Your instructor has asked you to prepare 2.00 L of 0.169 M NaOH from a stock solution of 53.4 (60.4) wt% NaOH with a density of 1.52 (60.01) g/mL. (a) How many milliliters of stock solution will you need? (b) If the uncertainty in delivering the NaOH is 60.10 mL, calculate the absolute uncertainty in the molarity (0.169 M). Assume negligible uncertainty in the formula mass of NaOH and in the final volume, 2.00 L.
- Q5/ Calculate the concentration of sodium ion in grams per liter after mixing 150mL of 0.200 M NaCl and 250ml of 0.250 M Na,S04. (20M) Atom weight = Na = 22.9897, Cl = 35.453, O = 16 H=1S = 32.065, Ca = 40.078 Ba = 137.327, C= 12.0107, N = 14.0067Example 2: You prepared a 0.250 M NH3 solution by diluting 8.45 (±0.04) mL of 28.0 (10.5) wt% NH3 [density = 0.899 (+0.003) g/mL] up to 500.0 (±0.2) mL. Find the uncertainty in 0.250 M. The molecular mass of NH3, 17.0306 g/mol, has negligible uncertainty relative to other uncertainties in this problem.(a) For use in an iodine titration, you prepare a solution from 0.222 2 (+0.000 2) g of KIO3 [FM 214.001 0 (+0.000 9)] in 50.00 (+0.05) mL. Find the molarity and its uncertainty with an appropriate number of significant figures. (b) Would your answer be affected significantly if the reagent were only 99.9% pure?
- What is the density of 47.0 wt% aqueous NaOH (FM 40.00) if 17.6 mL of the solution diluted to 1.80 L give 0.172 M NaOH?(a) How many grams of nickel are contained in 10.0 g of a 10.2 wt% solution of nickel sulfate hexahydrate, NiSO4 ? 6H2O (FM 262.85)? (b) The concentration of this solution is 0.412 M. Find its density.A 95.0 wt% solution of ethanol (CH3CH2OH, FM 46.07) in water has a density of 0.804 g/mL. (a) Find the mass of 1.00 L of this solution and the grams ofethanol per liter. (b) What is the molar concentration of ethanol in this solution?
- The organic base, tris-(hydroxymethyl)aminomethane (or simply TRIS or THAM) is an excellent primary standard. A 0.2486 g sample of the primary standard grad TRIS, (CH2OH)3CNH2 (M.M. = 121.14) was dissolved in distilled water and required 24.88 mL of a hydrochloric acid solution. Calculate the molarity of the solutionنقطتان )2( Sea water contains an average of 1.08 x103ppm of Na+ Calculate the * pNa sea water. (Na= 23) 1.10 1.11 O 1.12 O 1.13 1.14 O (2) jlibäi What is the mass in grams of solute in 4500 ml of a solution that contains 33.4 ppm of SnCl2? * (Sn=118 , Cl=35.5) 0.013 0.014 O 0.015 0.016 0.017 O نقطة واحدة Fill in the blanks .is the Nuantitativn rolotionchinamon theA 500.00 mg vitamin C (MW 176.12 g/mol) tablet was ground, acidified and dissolved in H2O to make a 250.0 mL solution. A 25.00 mL aliquot containing vitamin C, KI and starch was analyzed and titrated with 10.10 mL of 0.009128 M KIO3. what is the % vitamin C in the tablet. Answer = 97.42%