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(7.244 g +0.064 g )/(14.75 mL -8.5335 mL ) with approproate sig figs
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- A solution of HCl was titrated against sodium carbonate. What is the normality of acid for Trial 3 in the given data? T1 T2 0.3562 0.3479 0.3042 Weight (g) Initial V (mL) 0.80 1.60 0.40 Final V (mL) 35.20 36.70 39.80 Vol HCI used (ml) 35.10 39.40 N of HC (eq/L) 0.1954 0.1870 Average N of HCl (eq/L)7 of 26 > Calculate the percent mass per volume, % (m/v), of a dextrose solution containing 6.50 g of dextrose in 2.00 × 10² mL of solution. Note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v). mass/volume %: % (m/v)A solution of HCl was titrated against sodium carbonate. What is the average normality of acid in the given data? (MW Na₂CO3 = 106) T2 0.3479 0.3562 0.3042 Weight (g) Initial V (ml) 0.80 1.60 35.20 36.70 39.80 Final V (mL) Vol HCl used (mL) 35.10 39.40 N of HCl (eq/L) 0.1954 0.1870 Average N of HCl (eq/L)
- (4) a heterogeneous mixture What is the concentration of AgCl in an aqueous solution that contains 0.012 grams of AgCl in 8000grams of the solution? (1) 1.2 ppm (2) 1.5 ppm (3) 7.2 ppm (4).9.6-ppm es. S. es. es.Q10) A tablet that contained 500 mg of vitamin C (Molar Mass = 176 g/mol) was titrated with 20.15 ml. of KIO, to the blue end point. The same KIO, solution was used to titrate 12.1 mL of a commercial juice blend. The juice blend required 2.40 ml. of KIO, to reach the end point. How many milligrams of vitamin Care in the sample of juice blend a) 0.047 mg b) 0.05956 mg c) 47.0 mg d) 59 56 TEAs part of this experiment you will need to determine the concentrations of Fe* and SCN ions present in test tubes 1-9. These values can be calculated using the volumes and concentrations provided in Tables 1 and 2 of the Equilibrium Lab - Procedure and the dilution equation (M,V1 = M2V2). Note: the solutions provided in the lab, and therefore the tables in the lab document, are the compounds used to prepare the solution. You must determine the concentration of the ions based on how these compounds díssociate in solution Complete the following table by filling the the calculated initial concentrations of each substance. Be sure to: Pay attention to significant figures • Round appropriately Use decimal notation (not scientific) Do not include units Test Initial [Fe3*] (M) Initial [SCN'] (M) Tube 1 3 4. 6. 7 8. 2.
- 8. When cyanide poisoning intravenously administered 2% sodium nitrite solution (p = 1.011 g/mL). Calculate the molar concentration and titer of the salt in the solution. Key: c(NaNO2) = ) = 0.02022 g/mL 0.2930 mol/L; T(NaNO2 %3DPrecipitimetry The chloride in a 4.321-g food sample was precipitated through the addition of 50.00 mL of a standard AgNO3 solution (10.00 mL AgNO3 = 11.22 mL KSCN). The precipitate was coated with nitrobenzene and the mixture was diluted to 250.0 mL. A 50.00 mL aliquot was taken from the diluted solution and required 4.56 mL back titration with a %3D standard KSCN solution (22.33 mL KSCN = 0.9758 g AgNO3). %3D Formula Masses: AgNO3 = 169.87; CI = 35.45 Calculate the following: 1. Molar concentration of KSCN solution M %3D 2. Molar concentration of AgNO3 solution M %3D 3. % (w/w) chloride in the original sample =In the experiment conducted to determine the amount of acetic acid in vinegar, 8.2 mL of a 0.098 M NaOH standard solution was spent besides the phenolphthalein indicator. What is the value in grams of acetic acid in the vinegar sample? (Ma (CH3COOH): 60.05 g / mol)
- Q3/ A) 0.63 g of a sample containing Na CO,, 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 Na CO, and NaHCO, are in the mixture?What is the concentration of a standardized HCl solution that required 50.78 mL of HCl to titrate 0.7682 g of a primary standard Na2CO3? Na2CO3 + 2HCl --> H2CO3 + 2NaCl Na2CO3 = 105.99 g/mol ROUND OFF FINAL ANSWER TO FOUR (4) SIG FIGS.7:21 1 4 7 +/- Question 8 of 13 A 20.0 mL solution of NaOH is neutralized with 22.8 mL of 0.200 M HBr. What is the concentration of the original NaOH solution? 2 5 8 M 3 60 9 O Submit Tap here or pull up for additional resources XU x 100