Acid dissociation constant

Experiment 2: Examination of Buffers Purpose: Buffers can be used to resist change in pH in an acid or base solution. The purpose of the lab is to understand the properties of buffers in relative concentrations, in the presence of a strong acid/base and dilution of buffer components the ammonia/ammonium buffer system. In this case, these laboratory techniques associated with buffers are performed to determine the pH values in diluted solutions. This is done by observing the Henderson-Hasselbalch

Identification of Unknown Amino Acid & Measurements of Buffer Capacity Student #: 998493250 Authors: Young, Lee & Melissa Abstract The titration curve of the unknown exhibited many characteristics, such as equivalence points, pKa of ionizable groups, isoelectric point, and buffer regions, that are particularly distinct to lysine. For unclear reasons, the pH during the titration did not reach the pH for pure 0.2 M NaOH nor 0.2 M HCl and normal equivalence points expected at two extreme

and buffer solutions, as the results of the data from the biological materials were constantly compared to the data from both of these solutions. An acid is a substance which has an excess of H+ ions. Common characteristics of acids include tasting sour and reacting strongly with metals. The acid used in this lab was Hydrochloric Acid (HCl). A base is

Acid Base Extraction The purpose of this laboratory assignment was two-fold, first, we were to demonstrate the extraction of acids and bases, finally, determining what unknowns were present. Second, we were to extract caffeine from tea. These two assignment will be documented in two separate entities. Introduction: Acid/base extraction involves carrying out simple acid/base reactions in order to separate strong organic acids, weak organic acids neutral organic compounds and basic organic substances

desirability of a food (Glanz et al., 1998). Flavours are generally added to foods to enhance palatability, replace flavour loss during processing and/or storage, and to impart added flavour to analogue foods. Hydrolysates of proteins generated by acid, enzymes or fermentation have a long history of use as taste-enhancing and savoury flavouring materials in the food industry. Besides being important precursors in thermal process flavourings, protein hydrolysates are widely used in food products as

unknown Amino Acids with Acid and Base for Identification Chemistry 315- biochemistry Section 01-L1 Dr. Samantha Iverson Submitted by: Farnaz Imtiaz Submitted to: Mariana Dorrington June 20th, 2017 Introduction – Amino acids are the basic building blocks of the body and sources of energy, like fats and carbohydrates. They are structurally characterized by the fact that they contain nitrogen (N), whereas fats and carbohydrates do not. Therefore, only amino acids are capable

RESULTS & DISCUSSION For this experiment, titrations on a weak acid, acetic acid, and a buffer were performed. Acetic acid was titrated with NaOH in order to observe the half-equivalence point as well as the equivalence point. Then, the buffer and the buffered acetic acid solution prepared faced additional titration with NaOH and HCl to evaluate the differing buffering effects following the addition of a strong acid and strong base. Finally, the buffer’s buffering capacity was calculated. If the

Practical 3 – pH, Buffers and Determination of pKA for a Weak Acid. Introduction This experiment was designed to test the pH changes of a weak acid, acetic acid, when it is titrated with a strong base, NaOH. We conducted this experiment so that we could obtain a pH titration curve and from this, we can correlate and signify the relationships between pH, pKA, and the ratios between the acetic acid and NaOH. This practical was key to developing our understanding of buffers and how they accept and

following lab, the main goal is to determine the pKa of an acid-base indicator by means of spectroscopy. There are numerous types of spectrometers that can be utilized for the purpose of this lab; the one utilized for this lab is the Spec20D. An acid-base indicator is a substance that is added to s solution and indicates pH change by means of changing colors. For example, bromocresol green is an acid-base indicator, which is a monoprotic organic acid with a molecular weight of 698.02 g/mol. The absorbance

hydrochloric acid will affect the rate of decomposition of calcium carbonate. Hypothesis: That a higher concentration of hydrochloric acid will increase the rate of decomposition of calcium carbonate. Variables: Variables What we will measure: We’ll measure this by: IV The concentration of the hydrochloric acid Different concentrations are provided DV The mass of carbon dioxide that is produced Mass Loss Method CV Time, size of marble chips, temperature, amount of hydrochloric acid, weight of