Question

A Safety Note Safety glasses and gloves are required Procedure 1 Reading the pH A simple way to measure pH is to use pH paper To test the pH with pH paper, place 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 pH paper container. The pH is read as the number that cor responds to the color the paper turned. When you have completed the activity, answer Unit Quiz Questions 1 and 2 (p. 27). 9 Lumbar 1 Obtain 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 their pH values in Table 2.1. 3 Obtain two randomly selected unknown samples, and measure their pH using pH paper and a dropping Procedure 2 pl Applications Now, let's apply the scale to physiological system. The stomach contains concentrated bydrochloric acid ( HC), and the pH of the macht ranges between 1 and 3. Antacid d icts that raise the pH of the stomach contents to the way of condos, including astroesophageal r e monly known as heartburn. In this activity you will compare the electiveness of three widely available and is sting conce trated hydrochloric acid. 1 Obtain three glass test tubes, and label them 1, 2 and 3 with a Sharpie. 2 Obtain a bottle of 0.1 M hydrochloric acid (HCI), and record its pH in Table 2.2. 3 In cach tube, place 2 ml. of the 0.1 MHCL 4 Add about one-fourth of one crushed Tums table to Tube 1. Stir the contents with a glass stirring rod. 5 Add about one-fourth of one crushed Rolaids tablet to Tube 2. Stir the contents with a glass stirring rod. 6 Add about one-fourth of one crushed Allea-Seltzertab let to Tube 3. Stir the contents with a glass stirring rod. 7 Allow the tubes to sit undisturbed for 3 minutes 8 Measure the pH of the contents of each tube, and re- cord the values in Table 2.2 9 What effect did the antacids have on the acid? pipette. 4 Record the pH values in Table 2.1, and determine whether each substance is an acid, a base, or is neutral TABLE 2.1 Samples of Acids and Bases Samples Molecular Formula Acid #1 10 Based upon your observations, which antacid is the most effective at neutralizing the acid? Acid #2 Base #1 TABLE 2.2 Results of Antacid Test Molecular Formula Substance Tested for Active Ingredient) Base #2 pH of Solution Acid alone Unknown Samples он Acid, Base, or Neutral? Tums + acid Unknown #1 Rolaids + acid Unknown #2 Alka-Seltzer + acid 20 - Exercises for the Anatomy & Physiology Laboratory

Answer 1

Safety Note Safety are regui and gloves Procedure 2 pH Applications Now, ler's apply the pH scale to physiological systems. The stomach contains concentrated hydrochloric acid (HC, and the pH of the stomach contents ranges berween 1 and 3. Antacids are medications that raise the pH of the stomach contents to treat a variery of conditions, including gastroesophageal reflex, commonly known as beartbern. In this activity, you will compare the effectiveness of three widely available antacids in neutralizing concen- trated hydrochloric acid Procedure 1 Reading the pH A simple way to measure pH is to use pH paper. To test the pH with pH paper, place one or rwo 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 pH paper container. The pH is read as the number that cor responds to the color the paper turned. When you have completed the activity, answer Unit Quiz Questions 1 and 2 (p. 27). 1 Obtain three glass test tubes, and label them 1,2, and 3 with a Sharpie. 2 Obtain a boetle of 0.1 M hydrochloric acid (HC, and record its pH in Table 2.2 1 Obtain 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 3 In cach tube, place 2 ml. of the 0.1 M HCL 4 Add about one-fourth of one crushed Tums tablet to Tube 1. Stir the contents with a glass stirring rod. each bottle). 2 Measure the pH of each acid and base using pH paper and a dropping pipette, and record their pH values in Table 2.1. Add about one-fourth of one crushed Rolaids tablet to Tube 2. Stir the contents with a glass stirring rod. 6 Add about one-fourth of one crushed Alka-Seltzer tab- let 3 Obtain two randomly selected unknown samples, and measure their pH using pH paper and a dropping pipette. Tube 3. Stir the contents with a glass stirring rod. 7 Allow the tubes to sit undisturbed for 3 minutes. 8 Measure the pH of the contents of each tube, and re- cord the values in Table 2.2. What effect did the antacids have on the acid? Antacid neutralisses the acid 4 Record the pH values in Table 2.1, and determine whether each substance is an acid, a base, or is neutral. TABLE 2.1 samples of Acids and Bases Samples Molecular Formula pH 3:01 10 Based upon your observations, which antacid is the most effective at neutralizing the acid? Acid #1 H2So4 2:75 13 Acid #2 TABLE 2.2 Results of Antacid Test Na OH Base 1 Molecular Formula pH of (or Active Ingredient) Solution Substance Tested IB KOH 3:01 Acid alone Gea) Base #2 Cacog+2teel cacz +co,t He,o Acid, Base, Unknown Bastc Tums + acid (Caco) (teC) or Neutral? Samples pH CalogtZna Clg tcoytHg glon),+ 24c4 2ty0+ Açid 4.1 7.6 Basic Unknown #1 Basic Rolaids + acid Aspiain, Cnie Natt + Ha Nag tH0 tco2 Basie Alka-Seltzer + acid LNaHco a an Atacid Unknown #2 20 . Exercises for the Anatomy & Physiology Laboratory Lumbar