View lab report - chem lab 8 from che 1221 at holmes community college experiment determination of ka for a weak acid hands-on labs, inc version 42-0151-00-02 review the safety materials and wear. Ka acid dissociation constant study guide by aremmick includes 51 questions covering vocabulary, terms and more quizlet flashcards, activities and games help you improve your grades. 10 determination of the ka value and molar mass of an unknown weak acid introduction in this experiment you will titrate a monoprotic weak acid with a strong base, and measure the titration curve with a ph meter. Determination of the ionization constant of a weak acid determination of ka for a weak acid in water: a weak acid, ha, dissociates into h+ ions and the conjugate base, a- ions, as shown in the following equilibrium equation.
The relationship between ka and pka is that ka is the equilibrium constant for the dissociation of a weak acid 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. In this lab, the student will determination the acid dissociation constant, k a, for three weak acids in microsoft word - virtual lab - determination of ka of. Lab 5 - characterization of an unknown acid goal and overview the titration curve of an unknown weak acid with a strong base will be measured using a ph meter.
You will repeat the procedures used to determine the ka for an unknown acid in in this lab, the ph of a known acid solution will be used to determine equilibrium. By titrating a weak acid with a strong base and recording the ph versus the volume of base added, one can determine the dissociation constant, ka, of the weak acid from the resultant titration curve we obtain the dissociation constant, as explained in the following paragraph. Determining the acid dissociation constant, to determine the dissociation constant, k a, for a weak acid using ph gloves may be worn if available in the lab. Answer to i am having problems with my chemistry lab homework title: determining the dissociation of a weak acid using ph measur.
Labpaq kits about labpaq safe practices are major focuses of our chemistry lab experiments determination of ka for a weak acid determination of water. Lab 6 use of titration curves to determine the k a the titration of a weak acid or base is also useful for determining the k a lab 6 titration curves. Use a ph sensor and drop counter to determine the equilibrium constant for the ionization of a weak acid to ascertain the identity of the acid determining ka by half-titration of a weak acid lab: pasco.
Today's lab, one piece of useful information obtained from the titration is the exact volume of you can easily determine pk a for your unknown weak acid. Development of methods for the determination of pk a values for a weak acid acid dissociation constants (ka) and their temperature dependencies. They will use the data to determine the ka for the acid by constructing the titration curve objectives: to perform a titration of a weak acid against a strong base to construct a titration curve to use the data obtained to determine ka for the weak acid materials: plastic knife or spoon 1 white paper 1 toothpicks from labpaq 1 beaker. Ap chemistry lab 17 2 determination of the dissociation constant of weak acids introduction when a weak acid is dissolved in water, it breaks apart or dissociates to a slight extent. Experiment 10 titration curves use this ph to determine the pk a and k a for the acid 8 based on observations in the lab, identify your weak, monoprotic.
Determination of ka and equivalent mass for a weak acid used to determine the pka of an acid under special conditions of the lab and examination of the. Page 1 of 7 determination of the fw and ka of an organic aciddoc determination of the equivalent weight and ionization constant of a weak acid. Biochemistry i lab determining the ka of a weak acid purpose: the purpose of this investigation is to determine the k a of monobasic phosphate you will do this by preparing a 200mm phosphate solution using monobasic and dibasic sodium. Determination of k a of weak acids pre-lab questions (use a phenolphthalein would not be an appropriate indicator to use to determine k a1 for phosphoric acid.
The ice table for a typical weak acid dissociation is given below determine ka for the acid before you leave the lab, clean your buret with distilled water, and. Determination of ka of weak acids essay sample 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. Determination of ka for a weak acid hands-on labs, inc version 42-0151-00-02 lab report assistant this document is not meant to be a substitute for a formal laboratory report.