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Which substance is more concentrated?
0 mol/L of sulphuric acid OR 0.1 M of hydrochloric acid
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- Two beakers are placed in a small closed container at 25 oC. One contains 231 ml of a 0.267 M aqueous solution of FeClg; the second contains 416 ml of a 0.140 M aqueous solution of FeCla. Small amounts of water evaporate from both solutions. As time If we wait and that in the first gradually passes, the volume of solution in the second beaker gradually long enough, what will the final volumes and concentrations be increases decreases First beaker Second beaker Initial 231 ml 0.267 M 416 ml 0.140 M Final mL M ml MWater “softeners” remove metal ions such as Ca²⁺ and Fe₃³⁺ by replacing them with enough Na⁺ ions to maintain the samenumber of positive charges in the solution. If 1.0X10³ L of“hard” water is 0.015 MCa²⁺ and 0.0010 M Fe³⁺, how many moles of Na⁺ are needed to replace these ions?Ibuprofen (also known as Brufen) is an analgesic (pain killer) and anti-inflammatory drug. It is a weak carboxylic acid (Chemical Formula: C12H17C00H; K = 1.2 x 10-5). A Medical student from Lusaka Apex Medical University (LAMU) prepared a 0.4 M solution of Brufen to give to an accident victim with minor injuries but in a lot of pain. on i. Write a reaction equation showing how Brufen ionizes in water. ii. Write the acid ionization constant expression for Brufen iii. Calculate the percent ionization of Brufen in water Select one: O A C12H17COOH(ag) + H2OM → C12H17CO0'(aq) + H3O*(aq)} K = [C;;H1¬CO0"][H30*]. [C1,H17COOH][H=0] 0.55% %3D OB. + C12COO(ag) + H3O*(aq); K= [C1;;H17C00"][H,o*j. [C2H17COOH] C12COOH(a) + H2O¶ 0.55% C12COOH(ag) + H2O) → C12COO (aq) + H30*(aq), K = [C1;H3;C00"][H30*]. [C,2H17COOH][H=0] 0.0022 %3D [CH1,CO0"][H30*]. [C1H17COOH] Go O D. C12H17COOH + H2O C12H17CO0* + H3O*|K = 0.55% %3D
- a)Calculate the molarity of a 20% sodium hydroxide solution (SG = 1.2). b) How many milliliters of water must be added to 100 ml of this NaOH solution to make the solution 2.5N. a)What is the N of 15.2 ml of KOH if it reacts with 3.72 g of benzoic acid, C7H6O2, a monoprotic acid. b) If 54.8 ml of water has been added to the KOH solution, what is its final concentration? Problem # Formula Solution 1.a)Given: Required: b) Given: Required: 2.a) Given: Required 2.b) Given: RequiredPrepare 250 mL of a 1.0M solution of phosphoric acid from 75.0% phosphoric acid that is pure. The gram formula weight of phosphoric acid is 98.00g/mol, and density of 75.0% phosphoric acid is 1.685g/mLConsider the reaction of 50.7 mL of 0.310 M NaC₇H₅O₂ with 50.0 mL of 0.245 M HBr. (Ka of HC₇H₅O₂ = 6.3 x 10⁻⁵) a) After 0.0157 moles of C₇H₅O₂⁻ and 0.0123 moles of H⁺ have reacted, how many moles of C₇H₅O₂⁻ would be left in the beaker after the reaction goes to completion? b) How many moles of HC7H5O2 would have been produced after the reaction goes to completion? c) What would be the pH of this soultion after the reaction goes to completion?
- In one experiment, 0.0995M HCl was used to analyze soda ash and the following data were obtained: Mass of Na2CO3 0.2980 g Initial reading of HCl 0.20mL Final reading of HCl 20.00mL What is the percent Na2CO3 in the soda ash sample?Two (2) grams of vinegar solution was given to you to analyze for the percent acetic acid present in the vinegar. After the titration, 0.0015 moles of NaoH was used to neutralize the acetic acid solution. Calculate the percent by mass of CH3COOH in the vinegar. None of the other choices is correct. O 9.0% O 224 % O 50%to a solution of NH4Cl, a crystal of NH4Cl is added. The crystal falls to the bottom and more solid comes out of the solution. How would you classify the original solution?
- How many grams of solid Cu2SO4 5H2O (249.68 g/mol) must be dissolved in 400 mL of water to obtain a 0.0899 M Cu+ solution?What volume of 3.00 M CH3OH solution solution is needed to provide 0.270 mol of CH3OHMoles of NaOH at the equivalence point? Mass of H2C2O4·2H2O= 1.32191 g Volume of the H2C2O4·2H2O solution= 250.0 mL