[A-] / [HA]‚ where HA is the acid and A- is the dissociated acid. When comparing Ka’s‚ most commonly pKa is used‚ which is equal to –log Ka. In this experiment‚ the pKa of an unknown acid is determined by titrating it with NaOH and graphing its pH levels versus volume of NaOH titrated. The inflection point found by graphing is the equivalence point‚ and at half that volume is the half-equivalence point. At half equivalence‚ the [A-] = [HA]‚ so they cancel out in the equation Ka = [H3O+] [A-] / [HA]
Premium PH Acid
mol of CuSO4 and the mol/L concentration. Then this was used to find out how many mL of 0.5 NaOH solution is needed to react completely with all the copper (II) sulphate in solution. Then titrate ¼ of the estimated amount number of mL of NaOH needed to react with the sulphate solution. Then add 5 mL at a time NaOH until Cu(OH)2 precipitate does not form. Record the correct number off mL which forms to NaOH solution. Fold the filter paper and stick inside the funnel‚ and pour the solution of copper
Premium Sodium hydroxide Mole Kilogram
change occurs. COMPARE with the control (Flask 2) Record the new colour change AND number of drops required for this change in Table 1. NOW add 0.1M NaOH‚ drop by drop in the first flask until a definite colour change is observed. Record the colour change and number of drops required into Table 1. Continue the drop-by-drop addition of 0.1M NaOH until the colour changes again. Record the colour change and number of drops required in Table 1. PART 2: Place 1mL of 0.2M FeCl₃ into a 250mL
Premium Red Color Chemical reaction
titrating with NaOH solution. After all the experiment we got hta salt witch we weighted and we got our results. Experiment reactions: .33w of Zn(OH)2 x moles Zn(OH)2/m. moles Zn(OH2) x 1molZnCI2/1 mol Zn(OH)2 x g molZnCI2/1 mol of ZnCL2 = .4531 grams of ZnCI2 .4531g of ZnCl2 x 1 moles ZnCI2/m. moles ZnCI2 x 1molZn/1 mol of ZnCI2 x 65.39 of Zn/1 mol Zn = .2174g Zn Materials needed: Scale Burette Beaker Spatula Erlenmeyer flask Prenolpthen (color indicator) ZnCL2 NaOH Tube Vacuum
Premium Chemistry Titration Concentration
and pKa is the half-equivalence point where pH=pKa. In addition to the pH‚ Ka is an indication of an acids strength; pKa = - log Ka. B. The potential sources for errors in this experiment are the inconsistent and miscounting of drops of NaOH in the titration. The pipet must be held upright dispensing the exact size drops to have an accurate measurement. C. If your experimental Ka is 5.3 and the actual Ka of your unknown acid is 4.7‚ what is your %
Premium Acid Base Acid dissociation constant
Abstract: Mercerization or NaOH fiber surface treatment is one of the most popular surface treatment processes to make the natural fibers such as bamboo fibers compatible for use as reinforcing material in composites. But NaOH being a chemical is hazardous and polluting to the nature. This paper explores the possibility of use of naturally derived citric acid for bamboo fiber surface treatment and its comparison with NaOH treated Bamboo Fiber Composites. Untreated‚ 2.5 wt% NaOH treated and 5 wt% citric
Premium Water Water pollution Oxygen
Analysis of Soda Ash and Volumetric Analysis of a Carbonate-Bicarbonate Mixture Manalo‚ Ma. Cristina Joyce B. Department of Chemical Engineering‚ Faculty of Engineering University of Santo Tomas Espana‚ Manila A. Abstract Crude sodium bicarbonate or commonly known as soda ash may contain amounts of impurities like chlorides and hydroxides. The total acid neutralizing capacity of a soda ash sample‚ its alkalinity value‚ was stated in terms of mass of sodium carbonate. In doing so‚ any
Premium Titration PH Carbon dioxide
LE CHATELIER’S PRINCIPLE Castro‚ Lharize C. Experiment # 1 I. Introduction: In this experiment‚ using Le Chatelier’s principle‚ we will observe several responses of a system at equilibrium to various changes in external conditions. The experiment aims to investigate two equilibrium systems: (a) cobalt complexes and (b) chromate-dichromate equilibrium and explain observations in light of the Le Chatelier’s principle. II. Theory/Concepts: In 1884 the French chemist and engineer Henry-Louis
Premium Purple Temperature Color
precipitation and titration 5) If there is a known amount of HCl added to the beaker that penny is placed in‚ then determine the amount of HCl that was used up in the reaction of HCl and Zinc. Calculate the % of zinc in penny. 6) If zinc reacts with NaOH in the titration experiment‚ then zinc hydroxide will form. Check solubility rules to see if zinc hydroxide is soluble of insoluble. Then calculate for % zinc in penny. Questions: 1. What is the weight of a post 1982 penny? 2.5 grams 2. What is the
Premium Chemistry Solubility Chemical reaction
The burette and pipette were then washed to ensure accurate results. Subsequently‚ HCL and NaOH were poured in the beakers by a professional to avoid injuries as HCL and NaOH are both highly concentrated solutions‚ any spills on the skin can cause severe burns. Once all the solutions were organised‚ the burette and pipette were set up. The burette was safely held using a boss head
Premium Chemistry Concentration Chlorine