Complèté the stolchlometry table using the density (g/mL) vol. (mL) molecular reagent mass (g) mmoles equivalents weight 3-nitrophthalic acid 0.562 211 1.00 1.380 hydrazine (8% aq. wt./vol) 32 sodium dithionite 4.260 174 theoretical product luminol 177
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- . An aqueous HNOg solltion contains 1.623 kg HN/ kg Hat and has a specific gravity of 1-304 at 208. Express He composition of the soletion in: a. weight percent of HNO, b. Ibm HNO3(fts solution at 20°C mdarky eExample: What is the volume of HCl which is needed to prepare 100 ml of solution has 6 M conc. if you know the % of HCl equal 37 % sp.g was 1.18 g /ml. M=2%- 1000 M.wt. 1000 11.96 36.5 M,V M;V: - 6. 100 - 11.96. V: The volume will dilute to 100 mlIn synthesis of Aspirin, 2C7H6O3 + 4C4H6O3 ---> 5 C9H8O4+ 6C2H4O2 SA+AA--->A+AAcid If used 3.0g of SA and 6.0 ml of AA and obtained 1.306 g of aspirin Calculate the mass of acetic anhydride used? I am getting confused because the mass is in ML How do I calculate this mass whenn it is in ml?
- When a Vitamin C (ascorbic acid; MM = 176.12 g mol-1) tablet is crushed, dissolved and titrated with 0.0340 M KIO3(aq) to a purple/blue endpoint (given by a starch indicator), the volume of KIO3 used is 29.80 mL. If 60 mg of ascorbic acid is the recommended dietary allowance (i.e., 100% of the RDA), then what is the % RDA for the Vitamin C in the tablet? KIO3(aq) + 5 KI + 6 H+ → 3 I2(aq) + 3 H2O I2 (aq) + ascorbic acid → 2 I- + dehydroascorbic acidThe nomograph of mixture of dichloromethane and different solvents is shown below. 3. 0.1 0.2 0.3 0.4 0.5 0.6 %v MTBE-CH,CI, 10 20 50 100 %v THF-CH,CI, 10 50 100 %v Ethyl acetate-CH,CI, 10 50 100 %v Propanol- 10 20 50 100 CH,CI, The elutropic strength (e) of dichloromethane = The elutropic strength of 40% THF-CH,Cl, = When dichloromethane (CH,Cl,) is used as a mobile phase in separation of analytes on bare silica column, the analytes take long time to elute from the column. To decrease the time, 10% volume of propanol is added to the dichloromethane mobile phase. What is the elutropic strength of 10% propanol- CH,CI, = Which solvent is a stronger eluentSample: Saline 0.900% (m/v), in sodium chloride (NaCl). Data: M.A. (g/mol): Na = 22.9898; K = 39.0983; Cr=51.9961; Ag = 107.8682; Cl = 35.453; N=14.0067; O = 15.9994. Material available in the laboratory's warehouse: Reagents: distilled water; standardized solution of silver nitrate (AgNO₃), at a concentration of 0.09980 mols/L; Potassium chromate solution (K₂CrO₄) 1%; ammoniacal ferric alum solution [Fe(NH₄)(SO₄)₂] and; nitrobenzene (or cooking oil, alternatively); 0.1000 mols/L potassium thiocyanate (KSCN) standard solution. Glassware: beakers of all sizes available on the market; 50, 100, 150, 200 and 250 ml Erlenmeyers; 10.00 and 25.00 mL volumetric pipettes; 15.00 mL burette; 30.00, 50.00 and 100.00 mL volumetric flasks Calculate the molarity of saline, in terms of the NaCl concentration (concentration in mols/L). (a) 0.900 mols/L (b) 5.84 mols/L (c) 0.154 mols/L (d) 0.0154 mols/L
- Q1: What is the density (g/ml) of a 3.6M Sulfuric acid solution that is 29% H,So, by mass (Mwt. = 98)? Q2: Fill the blanks with suitable answers 1: The is the thing being dissolved. ......... 2: The branches of quantitative analysis are and 3. The filterability of the precipitate depend on the of practices. Q3: Which one is correct? 1. Molality changes with temperatures. 2. Molality does not change with temperatures. 3. Molarity changes with temperatures. 4. Normality changes with temperatures. Q4: What weight of pyrite ore (impure FeS,) must be taken for analysis so that the BaSO, precipitate weight obtained will be equal to one-half that of the percent S in the sample? Note: Mwt. of Ba =32, Mwt. of BaSo4 =233, Mwt. of FeS, =119Q1 // show by calculation how could you prepare 500 ml of 0.3N H3PO4 from its concentrated solution has density of 1.71 and percentage of acid equal 86% (w /w) ? Q2// Describe the preparation of 250ml of 0.3 M NAHCO3 ? A.W. H=1 P=31 0=16 C=12 Na=23Hexanoic acid was added to an immiscible biphasic solvent sysem, water and CCl4 at 20.0OC and the equilibrium concentrations of hexanoic acid were determined to be 3.66 g/L in H2O and 67.0 g/L in CCl4. Caluclate the distrubution coeffiecent (D1) of hexanoic acid in CCl4 with respect to water.