Science On DisplayScience On DisplayThe Chemical Change of The Chemical Change of Soda Bicarbonate and Soda Bicarbonate and

VinegarVinegar Class PresentationClass Presentation

By Conor BerryBy Conor Berry

January 27, 2010January 27, 2010

7-CZ7-CZ

HypothesisHypothesis• I believe that the higher the ratio of vinegar I believe that the higher the ratio of vinegar

to baking soda the better the resultto baking soda the better the result

ResearchResearch• Baking soda is sodium bicarbonateBaking soda is sodium bicarbonate• Vinegar is a weak acid Vinegar is a weak acid • When the two components are combined they make a strong rising of fizzWhen the two components are combined they make a strong rising of fizz• This is a multistep reactionThis is a multistep reaction

• The The sodium bicarbonate mixes with the acid to create carbon dioxide and sodium bicarbonate mixes with the acid to create carbon dioxide and

waterwater

MaterialsMaterials

• Baking soda Baking soda

• VinegarVinegar

• Something to hold mixture inSomething to hold mixture in

• Low gauge for measuring PSILow gauge for measuring PSI

• Balloon Balloon

• Measuring spoonMeasuring spoon

ProceduresProcedures • Pressure MethodPressure Method

– Measure vinegar and baking soda. Measure vinegar and baking soda. – Pour each into my device and seal them.Pour each into my device and seal them.– Shake container to mix vinegar and baking soda.Shake container to mix vinegar and baking soda.– Read psi gauge to measure the amount of pressure.Read psi gauge to measure the amount of pressure.– Record pressure observed on log and graph.Record pressure observed on log and graph.– Repeat for each vinegar / baking soda combination.Repeat for each vinegar / baking soda combination.

• Volume MethodVolume Method– Measure vinegar and baking soda. Measure vinegar and baking soda. – Pour each into my device and seal them.Pour each into my device and seal them.– Shake container to mix vinegar and baking soda.Shake container to mix vinegar and baking soda.– Measure circumference of the balloon with string. Measure circumference of the balloon with string. – Record circumference observed on log and graph.Record circumference observed on log and graph.– Repeat for each vinegar / baking soda combination.Repeat for each vinegar / baking soda combination.

Pressure Method Pressure Method Pressure in Kilograms per Square CentimeterPressure in Kilograms per Square Centimeter

Due to Baking Soda - Vinegar Mixture Due to Baking Soda - Vinegar Mixture

Baking SodaBaking Soda

VinegarVinegar 7.4 ml7.4 ml 14.8 ml14.8 ml 22.2 ml22.2 ml 29.6 ml29.6 ml 37.0 ml37.0 ml AverageAverage

25 ml25 ml 0.10.1 0.20.2 0.50.5 0.40.4 0.20.2 0.30.3

50 ml50 ml 0.50.5 0.20.2 0.70.7 0.50.5 0.60.6 0.50.5

75 ml75 ml 1.01.0 0.90.9 0.90.9 1.01.0 1.01.0 1.01.0

100 ml100 ml 1.01.0 1.21.2 1.21.2 1.11.1 1.31.3 1.21.2

125 ml125 ml 1.01.0 1.41.4 1.51.5 1.51.5 1.51.5 1.41.4

AverageAverage 0.70.7 0.80.8 1.01.0 0.90.9 0.90.9 0.90.9

Balloon MethodBalloon Method Balloon Circumference in Millimeters Balloon Circumference in Millimeters

Due to Baking Soda - Vinegar Mixture Due to Baking Soda - Vinegar Mixture

Baking SodaBaking Soda

VinegarVinegar 7.4 ml7.4 ml 14.8 ml14.8 ml 22.2 ml22.2 ml 29.6 ml29.6 ml 37.0 ml37.0 ml AverageAverage

25 ml25 ml 28.028.0 27.527.5 36.036.0 28.528.5 14.014.0 26.826.8

50 ml50 ml 30.030.0 33.033.0 33.033.0 33.533.5 34.034.0 32.732.7

75 ml75 ml 36.536.5 37.537.5 38.038.0 40.540.5 39.039.0 38.338.3

100 ml100 ml 36.036.0 40.040.0 45.045.0 43.543.5 45.045.0 41.941.9

125 ml125 ml 38.038.0 46.046.0 45.045.0 44.544.5 45.045.0 43.743.7

AverageAverage 33.733.7 36.836.8 39.439.4 38.138.1 35.435.4 36.736.7

7.4ml

14.8ml

22.2ml

29.6ml

37.0ml

25 ml

75 ml

125 ml

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Recorded Pressure in

Kg/cm

Baking Soda Amount

Vinegar Amount

Change in Pressure Due to Baking Soda - Vinegar Mixture

ConclusionsConclusions

• My hypothesis was that the higher the ratio My hypothesis was that the higher the ratio of vinegar to baking soda the better the of vinegar to baking soda the better the result.result.

• I tested my hypothesis using two methods.I tested my hypothesis using two methods.– the pressure methods using a pressure gaugethe pressure methods using a pressure gauge– the volume method measuring the circumference the volume method measuring the circumference

of a balloonof a balloon

• The reactions were the same for both The reactions were the same for both methods. methods.

• The more baking soda and the more vinegar The more baking soda and the more vinegar the greater the reaction and the more gas.the greater the reaction and the more gas.

• In my mind my hypothesis was correct.In my mind my hypothesis was correct.