exploring anatomy & physiology in the laboratory by Erin c.amerman 3rd edition O
ID: 194900 • Letter: E
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exploring anatomy & physiology in the laboratory by Erin c.amerman 3rd edition Often when asoms or molecules umeract, chemical bonds are formed beoken, or rearranged, or electrons are transferred between molecales Procedure 2 ..…n estremely pH Applications Procedure 1 Reading the pH A simple way to measure pH is to use pH paper (Figure 2.2). To test the pH with pH paper, drop one or two drops of the sample solution on the paper with a dropping pipette, and compare the color change with the colors on the side of the phl paper container. The pH is read as the number that corresponds to the color the paper tuned 2 Salety glasses and gloves are required 1 Obeain two samples each of known acids and bases, and record their molecular formulae in Table 2.1 (the molecular formula should be on the side of each bottle). 2 Measure the pH of each acid and base using pH paper and a dropping pipette, and record its pH values in Table 2.1, FGURE 2.2 pH paper and indicator strip 3 Obeain two randomly sclected unknown samples, and measure their pH using pH paper and a dropping pipette. 4 Record the pH values in Table 2.1, and determine if this substance is an acid, a base, or is neutral. TABLE 2.1 Samples of Acids and Bases Molecular Formula Acid #1 Acid #2 Base #1 Base #2 Unknown Samples Unknown #1 pH Acid, Base, or Neutral Unknown #2 361 Exploring Anatomy& Physiology in the Laboratory: Core ConceptsExplanation / Answer
acid#1 HCl(Hydrochloric acid) pH=3
acid2 citric acid(C6H8O4) pH=3
base 1 K2CO3(Potassium carbonate) pH=10
base 2 Magnisium hydroxide(Mg(OH)2) pH=10.4
Unknown 1 pH= 2.5 acid
Unknown 2 ph=7 neutral
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