Melissa Carrithers AP Chemistry period 6 2-11-15 Determination of Ka of Weak Acids Purpose: The purpose of this lab is to find the strength of weak acids by determining the equilibrium constants for their ionization reactions in water. Is to use their measured pH values to calculate the pKa for the two unknown weak acids thus determining their identities. Hypothesis: If we neutralize a solution that contains a weak acid by adding a strong base to the solution‚ then the ions will be isolated and
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.............................................................5 Reference………………………………………………………………………………………6 INTRODUCTION The objective of this Essay is to discuss whether the Bank of Zambia monitoring of the Balance of payments regulations is an indirect way of the introduction of foreign exchange controls. Sunday 5th May‚ 2013 the Minister of Finance Mr. Alexander Bwalya Chikwanda‚ MP‚ signed a Statutory Instrument which will bring into force the Bank of Zambia Regulations of Monitoring of Balance
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that Helen Keller offers in her story is about Perseverance and Determination. She develops this theme because in her story she did go through a major change in her life. The impact and lessons readers took away from The Story of My Life is the value of perseverance. Without the ability to see or hear‚ Keller learned to function and interact within the community in a meaningful and healthy way. Her motivation‚ commitment‚ and determination to make a place for herself in the world started when she was
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Experiment 2 Title: Determination of Quinine in Tonic Water Objective: To Determine the Concentration of Quinine Hydrochloride in Sample (Schweppers) given‚ by plotting a Calibration Curve of Fluorescent Intensity against Concentration of Quinine Hydrochloride in ppm‚ after Fluorescence Intensity of a series of Standard Solution prepared and the Sample solution by Fluorescence Spectrometer. Data: Brand name of tonic water sample: Schweppes Dilution factor = 1000 Concentration of
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using graduated cylinder to obtain volume. Density 4‚ 5 & 6 calculated by using volumetric pipette to obtain volume. Density 7‚ 8 & 9 calculated by using burette to obtain volume. All experimental values obtained have been included in this determination. Average density calculated numerically: Average density = sum of all densities divided by total number of densities measured Average density = (density 1 + density 2 + density 3 + density 4 + density 5 + density 6 + density 7 + density 8
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Determination of Concentration of Potassium Hydroxide Weigh boat 0.87g Weigh boat + Sulphamic acid 3.29g Weigh boat after transfer 0.87g Sulphamic acid 2.42g | Trial | 1st | 2nd | 3rd | 4th | 5th | Start | 3.00 | 3.20 | 5.20 | 18.55 | 1.90 | 14.65 | Finish | 17.35 | 18.10 | 18.10 | 31.50 | 14.65 | 27.65 | Titre | 14.35 | 14.90 | 14.90 | 12.95 | 12.75 | 13.00 | Average titre = 12.90cm3 NH2SO3H + KOH – NH2SO3K + H20 Sulphamic Acid Standard Solution Moles from mass
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Introduction A complex ion consists of a metal ion with Lewis bases attached to it. These Lewis bases form strong coordinate covalent bonds with the central complex ion in which both electrons of the bond are donated by the Lewis base. The Lewis bases that form this complex are referred to as ligands and they are typically either neutral molecules or anions. Polydentate ligands have multiple lone pairs of electrons that enable them to bond multiple atoms to the central metal atom. The stability
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At its threshold‚ he passed the Harvester‚ Who sensed the determination of the huntsman. He besought him to reconsider continuing forward; “You will not make it far like that!” he warned. The huntsman scoffed at the first beast’s warning Presuming his words were a means of intimidation. He continued into the woods‚ where the next of the five waited‚ Leaving the gentle Harvester in a daze. Well‚ days passed‚ then weeks‚ and then months; And there was no evidence of the huntsman’s return. Many wondered
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Complexometric Determination of Water Hardness 9/12/2013 Abstract: Two sets of acid-base neutralization titrations were conducted for experimental analysis. The first set of titrations was to standardize a solution manufactured in the lab. An approximate solution of Na2EDTA of 0.004 M was titrated against a known solution of 1.000 g CaCO3/L to deter mine to exact molarity of the Na2EDTA. Ca2+ + Na2EDTA → CaEDTA + 2Na+ The second set of titrations was to use the now standardized Na2EDTA
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Acid Determination of Vitamin C Tablets and Salt Solutions Chem 1290-016 03-05-2010 ------------------------------------------------- Purpose: The purpose of this lab was to use acid-base titrations to find the mass percent of ascorbic acid in a Vitamin C tablet. A known concentration of sodium hydroxide was used and the value found was compared to the stated amount of ascorbic acid listed on the vitamin container. Also in this lab the acidity of different salt solutions were tested using
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