Calculate the HLB value for the surfactant shown below. Use equations specifically designed for non-ioninic surfactants to determine HLB. Select one: Chemical Formula: C 16H3405 Molecular Weight: 306.44 a. 8.6 b. 9.0 O c. 7.0 O d. 12.6 O e. 14.1 Clear my choice OH
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- Part A) A 10.0 mL sample of 0.250 mol/L NiF2(aq) is mixed with 20.0 mL of 0.0900 mol/L NaOH(aq) and then diluted to a final volume of 100. mL.Calculate the concentration of Ni2+ ions in the 100 mL mixture before the reaction starts. Express your answer to three significant figures.ksp: 5.48e-16An average individual drinks 3 L/day of water (daily) containing 0.2 mg/L of contaminant A (with reference dose 0.008 mg/kg.d, PF = 0.65 (mg/kg.d)1) for 20 years. The CDI (in mg/kg.d) is OA 4 103 OCA0 OD None of the ed OH1 13Dissolve 5.0 g aluminium in 150 cm3 of 25 m/m % (with density of 1.06 g/ cm3) sulfuric acidsolution. What is the mass of the produced Al2(SO4)3 ?MM[Al]=26.98 g/molMM[H2SO4]=98.08 g/molMM[Al2(SO4)3]=342.2 g/mol
- As 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. 2.202902 TARG statements is NOT true? SARGI drinking water should Which of the 37 Soru Henüz cevaplanmadı O a. Arsenic is not able to cross the placenta and blood-brain barrier. d. "IARC classifies arsenic in the chemical substances group known to be carcinogenic to humans No The gastrointestinal absorption of dissolved arsenic in water is high. 20943 The World Health Organization recommends that the arsenic concentration Ob. not exceed 0.01 mg/L 3,25 üzerinden işaretlenmiş P Soruyu işaretle 20942 Group 1). Due to the high sulfhydryl groups arsenic accumulates in nail and hair. NARG 20290942 NARG NARGIZ GOLIYEN 90942 LIYEWhat volume of concentrated H2SO4 (18.OM) is required to prepare 550mL of 4.00M H2SO4 solution? Consider the reaction: BaCl2 + K2CrO4 → BaCrO4 + 2KCI a. How many grams of Barium chromate (253.33g/mol) can be obtained from 75.0mL of 0.150M BaCl2 solution? b. What volume of 0.500M K2CrO4 solution is required to react with the 75.0mL of 0.15M BaCl2 solution?
- 1. What mass of MC| is needed to make 3000g or 109 solution? (MW: H= 1 , Cl= 35)a. 0.09 gb. 90 gc. 900 g d. 0.9 g 2. Detemine the mole faction of the solvent in a solution prepared by dissolving: 36g of CH3OH in 1000 of H2O. a. 55.55molesb. 0.02molesc. 0 98molesd. None of the above25. How many milliliters of water should be added to 100 mL of a 1:125 w/v solution to make a solution such that 25 mL di- luted to 100 mL will yield al:4000 dilu- 33. tion? of a lotion base f oxico- 26. How many millilitersWhich of the following will result to a brightly lit light bulb when subjected to the conductivity test? a. Mixture of 10.0 mL 1.0 M Mg(OH)2 and 10.0 mL 1.0 M HNO3 b. 70% (v/v) ethanol c. 1.0 M citric acid d. Glacial acetic acid
- 25- How to prepare 70% (v/v) Ethanol in water? (Ethanol is absolute, Mwt 46 g/mol) A) By Diluting 140 mL of Ethanol 2000 ml B) By Diluting 140 mL of Ethanol 1000 mL volumetric flask. C) By Diluting 140 mL of Ethanol 200 mL D) By Diluting 70 mL of Ethanol 1000 ml volumetric flask. volumetric flask. volumetric flask.Q: The Soluibility of GaC13 is 0.004M. What is the Ksp? * O 7E-9 O 9 E-9 O 4.7 E-10 O 2.8 E-9 O Does not exist O 3.5 E-8 O 8 E-9 Q: What is the normality of Si(NO3), if we added 107g of this sa solution 250ml? N= 9 eqv.\L2. A 1500ml of water was added to 300ml of 0.50M NaOH solution. a. What is the new volume of the solution? b. What is the new concentration of the solution in M and N? MW Na:23, 0:16, H:1