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Determination of Acetic Acid in Vinegar

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Determination of Acetic Acid in Vinegar

Objective: The purpose of this experiment is to determine the concentration of acetic acid (in parts per thousand) present in a sample of vinegar. This will be achieved by using the method of titration with standard sodium hydroxide using phenolphthalein indicator.

Procedure: * Prepare 0.1 M sodium hydroxide * Using a graduated cylinder measure 7.0mL of saturated NaOH * Pour the saturated NaOH into a 1 Liter bottle * Use distilled H2O to fill the bottle and shake until mixed * Set solution aside for later use in this and other experiments * Standardization of NaOH titrant * Get 4g of KHP or potassium acid phthalate (KHC8H4O4) from TA * Record its purity factor * Weigh out three samples of 0.7-0.9g KHP into 250mL Erlenmeyer flasks using the weigh by difference technique and recording to the fourth decimal place. * Add distilled H2O to the 50mL line on each flask and dissolve completely * Add 2 drops of the phenolphthalein indicator to each flask * Titrate until the solution turns a faint pink for longer than 20 seconds * Determination * Pipet 25mL of vinegar into a 250mL volumetric flask * Using distilled H2O fill to 250mL mark then mix to obtain your main solution * Take 50mL of this solution and put in a new 250mL Erlenmeyer flask * Add 2 drops of the phenolphthalein indicator and 25mL distilled H2O to the new flask * Titrate until the solution turns a faint pink for longer than 20 seconds * Repeat steps 3-5 two more times * Data * Find the number of grams of acetic acid per 100mL of vinegar in the given sample * Estimate the standard deviation for the entire method

Hazard Table:
Chemical Name: Water Chemical Formula: H2O Molecular Weight (g/mole): 18.02 State: liquid Hazard Information: N/A
Chemical Name: Carbon Dioxide Chemical Formula: CO2 Molecular Weight (g/mole): 44.01 State: gas Hazard Information: May cause respiratory tract eye, and skin irritation. Can cause organ damage. Do not puncture or incinerate container. Can cause rapid suffocation.
Chemical Name: Acetic Acid Chemical Formula: C2H4O2 Molecular Weight (g/mole): 60.05 State: liquid Hazard Information: Very hazardous in case of skin contact (irritant), of eye contact (irritant), of ingestion, of inhalation. Hazardous in case of skin contact), of eye contact (corrosive). Liquid or spray mist may produce tissue damage particularly on mucous membranes of eyes, mouth and respiratory tract. Skin contact may produce burns. Inhalation of the spray mist may produce severe irritation of respiratory tract, characterized by coughing, choking, or shortness of breath.

Chemical Name: Phenolphthalein Indicator Chemical Formula: N/A Molecular Weight (g/mole): N/A State: liquid Hazard Information: Hazardous in case of skin contact (irritant), of eye contact (irritant), of ingestion, of inhalation. Slightly hazardous in case of skin contact (permeator). Severe over-exposure can result in death.

Chemical Name: Sodium hydroxide Chemical Formula: NaOH Molecular Weight (g/mole): 40 State: solid Hazard Information: Very hazardous in case of skin contact (corrosive, irritant, permeator), of eye contact (irritant, corrosive), of ingestion, of inhalation. The amount of tissue damage depends on length of contact. Eye contact can result in corneal damage or blindness. Skin contact can produce inflammation and blistering. Inhalation of dust will produce irritation to gastro-intestinal or respiratory tract, characterized by burning, sneezing and coughing. Severe over-exposure can produce lung damage, choking, unconsciousness or death.

Chemical Name: potassium acid phthalate Chemical Formula: C8H5O4K Molecular Weight (g/mole): 204.22 State: Crystals Hazard Information: May cause eye irritation. May cause skin irritation. May be harmful if absorbed through the skin. May cause irritation of the digestive tract. May be harmful if swallowed. May cause respiratory tract irritation. May be harmful if inhaled.

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