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- From an experiment on acid-base titration, in the standardization of HCl (Part B), why must the flask be covered with watch glass or inverted beaker? (min. 5 sentences)Sodium hydroxide (NaOH) is a reagent in the form of crystals and is highly hygroscopic. It is advisable to standardize it when it is desired to use it in acid standardization solutions. Knowing that 12g of the base (NaOH) were used to prepare 1L of solution, determine the actual concentration of the solution (NaOH) for a 50mL sample where 55 mL of 0.3N hydrochloric acid were used, and the volume of the said base to prepare 1L of 0.01N solution. (Data: Molar Mass of NaOH = 40.0g/mol).What is impoantant about mass percent in chemistry? What does it do in the context of a acid-base titration?
- Calculate the pH of the mixture of 94 mL butanoic acid (CH3CH2CH2COOH) 0.189 mol/L with 109 mL sodium butanoate (CH3CH2CH2COONa) 0.207 mol/L.Give an answer with at least 3 decimal places.Students Mola and Rity were tasked to analyze the acidity of a 10.0-mL fermented milk sample diluted with water in a 250-mL volumetric flask. Mola obtained a 15.0-mL aliquot of this solution, diluted it to 50.0 mL, and then titrated this diluted sample. Titration data were given to Rity and she found out that the 50.0-mL diluted sample contains 0.21 mmol of lactic acid. MW: Lactic Acid (90.08) a. What is the lactic acid concentration (in M) of the titrated sample? b. Determine the lactic acid content (in M) of the 10.0-mL fermented milk sample. c. What is the lactic acid concentration (in %w/v) of the 10.0-mL fermented milk sample?WHAT IS THE SIGNIFICANCE OF THE RATION OF STRENGTHS OF ACIDS AND BASES? what is the purpose of drying the primary standard before usage?
- Does pH (H+/OH-balance) affect the movement of Polident molecules in solutions? Does Polident contain acidic or basic ingredients? How will the Polident ingredients interacts with the H+/OH- balance in the different pH solutions?Tartaric acid is found in many fruits, including grapes, and is partially responsible for the dry texture of certain wines. Calculate the pH and the tartrate ion 1C4H4O6 2-2 concentration for a 0.250 M solution of tartaric acid, for which the acid-dissociation constants. Did you have to make any approximations or assumptions in your calculation?Q4 chapter 15 titration: multimedia activities