Distilled (or deionised) water, 125 cm 3, x2.Sodium hydroxide solution, 0.4 M (IRRITANT), small bottle with dropper.Phenol red indicator solution (HIGHLY FLAMMABLE), access to small bottle with dropper.Thymolphthalein indicator solution (HIGHLY FLAMMABLE), access to small bottle with dropper.Ethanol (IDA – Industrial Denatured Alcohol) (HIGHLY FLAMMABLE, HARMFUL).Indicator bottles with dropping pipettes, x3.The equation for the reaction between carbon dioxide and water may be introduced for appropriate students. If students have not yet met the compositions of inhaled and exhaled air, this experiment can serve as part of the learning sequence for the topic of breathing and respiration in an introductory science course, using an appropriately elementary approach to the chemistry involved.įor students who have already covered the topic of breathing and respiration, and know that carbon dioxide is a significant component of exhaled air, the focus in this experiment can be transferred to the nature of the chemical reaction (other related topics could be acid rain, gas liquid reactions or indicators). Carbon dioxide present in exhaled air is blown into a flask containing an indicator sensitive to small changes of pH in the appropriate region of the pH scale, and the consequent colour changes observed and recorded. When carbon dioxide reacts with water a weak acid is formed. This is a relatively brief and straightforward exploration of the reaction of carbon dioxide and water at a simple level, which should take no more than 15 minutes. RSC Yusuf Hamied Inspirational Science Programme.Introductory maths for higher education.The physics of restoration and conservation.On behalf of the United States of America. Shall not be liable for any damage that may result fromįor NIST Standard Reference Data products. However, NIST makes no warranties to that effect, and NIST Uses its best efforts to deliver a high quality copy of theĭatabase and to verify that the data contained therein haveīeen selected on the basis of sound scientific judgment. The National Institute of Standards and Technology (NIST) Data from NIST Standard Reference Database 69:.Temperature dependence parameter for Henry's Law constant The value is taken from the compilation of solubilities by W. Missing citation refer to several references in their list of Henry's law constants but they don't assign them to specific species. Missing citation give several references for the Henry's law constants but don't assign them to specific species. The quantities A and α from missing citation were assumed to be identical. ![]() The partial pressure of water vapor (needed to convert some Henry's law constants) was calculated using the formula given by missing citation. K the tabulated data could not be parameterized by equation (reference missing) very well. K from missing citation was used to derive k H and -Δ k H/R. K° H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))ĭ(ln(k H))/ d(1/T) = Temperature dependence constant (K) ![]() Secretary of Commerce on behalf of the U.S.A.ĭata compiled by: Rolf Sander Henry's Law constant (water solution) ![]() Your institution may already be a subscriber.įollow the links above to find out more about the dataīy the U.S. With the development of data collections included in The purpose of the fee is to recover costs associated NIST subscription sites provide data under theĭata Program, but require an annual fee to access.
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