100 grams of water, there are 3.5 grams of of dsbiled is the amount of NaCi a As

Question

100 grams of water, there are 3.5 grams of of dsbiled is the amount of NaCi a Assume that 50.0 mL of water weight 50.0 o dissolve in How many Weigh out the the weight to of ia in the with a ph 7. How w ind he ar in the flack and str Measure and record the pH b. What color is the solution acidie or 8 Crea straw and blow into the seawater Do not Watch for a color change and kedb track solution, and the number of breaths unt the of the number of breaths needed to first see a change in the color color of the nt from the pH of fresh water? pH or d What effect does the carbon dioxide you exhaled int Does carbon dioxide make the seawater more ater have on the pH raise the pH? evidence you used to reach this e. How does the response of to carbon diaxide compare to the Clean up: All solutions should be disposed of in the s waste botties-combine waste into one beaker to minimize trips to the bottle. pH strips and pipets should be disposed of in the yellow solid hazardous waste but clean Wpe down the bench space Turn in a copy of your lab notes before you leave for the day condainer under the hood. Labels should be removed from test tubes. Glassware, the weigh boat and other equipment from the locker should be washed excess water shaken out, and returned to the locker wet III. Lab Report- due in one week. person writes his or her own lab report Be sure your report has the title of the experiment, the date, your name, and the name of your lab partner. All reports must be written neatly, and all questions answered in complete sentences. Write your report on a new page in your lab notebook. Part A. How much carbon dioxide do you emit in a year? 1. Wirite your oniginal hyoothesis about how the volume of CO, exhaled in a year compares t produced by burning a gallon of gasoline the volume of CO 83

Explanation / Answer

Answer 1 -

Let's assume we breath 14 times in a minute.

This answer we can solve by doing an experiment. In this experiment, the exhaled air is bubbled into a NaOH solution. Dissolution of CO2 in water leads to the following reaction

CO2  + 2H2O = H2CO3 = H2O = H3O+ +  HCO3-

So if we pass the carbon dio oxide from this solution then the pH will change. The pH will change from basic to acidic.

So to maintain the pH we have to add NaOH to the solution. To find the amount of CO2 exhaled in one minute, we have to calculate the amount of NaOH you had to add in order to return the pH to its original level.

1 ml of 0.04% NaOH titrates 10 µmoles of CO2 . To calculate the total amount of CO2 exhaled we have to add 0.04% NaOH and multiply it by 10 because 1ml of 0.04% NaOH titrates 10 µmoles of CO2 .

So Co2 exhaled in 1 minute (µmoles) = total volume of 0.04% NaOH x 10

The molecular weight of CO2 is 44 g

Weight Of CO2 exhaled in 1 Minute (µg) = Amount of CO2 in µmoles x 44.

For me the amount of 0.04% NaOH to maintain the pH was found as 899 ml

So Co2 exhaled in 1 minute (µmoles)= 899 * 10 = 8990 µmoles

Weight Of CO2 exhaled in 1 Minute (µg) = 8990 * 44 = 395560 µg = 0.395560 grams

weight of CO2 exhale per year = 0.395560*365*24*60 = 207906.336 grams = 207.9063 Kg

If we want to convert it into Volume then

by STP 44g of CO2 has volume = 22.4 ml

1 g of CO2 has volume = 22.4/44

207906.336 has volume = (22.4*207906.336)/44 = 105843.226 ml = 105.843 L

For Gasoline

When gasoline burns, the carbon and hydrogen separate. The hydrogen combines with oxygen to form water (H2O), and carbon combines with oxygen to form carbon dioxide (CO2).

Molecular Weight of CO2 = 44

General composition of gasoline = 87% carbon and 13% hydrogen by weight

1 Gallon = 2.8576 Kg

the carbon in a gallon of gasoline = 2.8576*0.87 = 2.486 Kg

Weight of CO2 = 2.486*44/12 = 9.115 Kg

If we convert it into litre then

CO2 in Litre = 9.115 * 22.4 / 44 = 4.64 Litre ( as we convert CO2 previously)

so by result we can say that we exhale 22.81 times CO2 emitted by 1 gallons of gasoline.

Thanks

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