Determining the concentration of Vinegar

1. Place an electronic subdue on a level turn come out and put a 50g fish on the scale and calibrate 2. Measure the weight of cone-shaped flask 3. Accurately greenback a caboodle of KH(C8H4O4) near to 5g, placing it in a 250ml conelike flask 4. genius the reading from the scale, subtract the weight of conical flask measured in footstep 2 5. crash KH(C8H4O4) in a conical flask with minimum majority of distilled peeing 6. Transfer the solvent from the conical flask into Standard Solution 1. pulmonary tuberculosis an electronic balance equal to ternion decimal places to accurately weigh out in a 250ml beaker a mass of KH(C8H4O4) approximately equal to 5. 005g. Record this mass. 2. Dissolve the KH(C8H4O4) in a minimum mass of distilled water in a beaker.3. subsequently washing the 250ml volumetric flask with distilled water, moisten with more distilled water. 4. Transfer the solution from the beaker to a volumetric flask using a funnel. 5. Wash all traces of the solu tion from the beaker and funnel by rinsing the beaker and funnel exhaustively with distilled water from a wash feeding bottle into the volumetric flask. 6. Swirl the solution in the volumetric flask but do not hold back. 7. Add more distilled water until the bottom of the meniscus is aligned with the normalisation mark.To ensure accuracy use a teat pipette to add the closing few millilitres of distilled water. 8. Stopper the flask and invert several times to mix the confine and thereby ensure the solution is of identical concentration throughout. Standardisation of Sodium hydroxide 1. Prep atomic number 18 the burette and fill with the atomic number 11 hydroxide solution to 50ml. 2. Pipette the KH(C8H4O4) solution into a conical flask. Use three drops of phenolphthalein as the indicator. 3. Titrate carefully until a colour change from colourless to solicit is observed. 4. Perform a rough titration first, then repeat until 3 concordant titres are obtained.