Question

Part A. pH estimation and explanation There are three methods to determine pH (Table 4). For litmus strips, red litmus paper turns blue in basic solution but stays red in acidic solution, while blue litmus paper turns red in acidic solution but stays blue in basic solutions. For the liquid universal indicator and pH 1-14 test papers, compare its color with the scale provided on the package to determine pH. When using litmus strips and pH 1-14 paper, use a stirring rod to spot a drop of your solution onto the test strip, rather than dipping the strip into your solution. Table 4. pH determination Method for pH estimation pH Litmus strips Acidic or basic pH 1-14 test papers Liquid universal indicator pH 0-14 pH 0-14 Assume 0.01 M solutions of HCI, CH3COOH, NaOH, NH3-H2O, NaCl, KCI, Na2CO3, NH4CI. Estimate and explain the pH. Write balanced chemical equations. Assume solutions of vinegar, orange juice, drain cleaner, coffee, blood, soda, battery acid, milk and hand soap, respectively. Estimate the pH in each solution (What methods should you use to determine pH?). Use Phet simulation.

Answer 1

<sub>and ماوه determine acid and are vinegar, oranger juice, coffee they fare mild acid having p around 3-4 be with ph paper * Drain deaner battery Soda with pH around OM paper ish with value 1-14 is helpful to determine on Milk and hand soap Basic in na tuge. Blood pH 7.4 strangly acidic 2 * Blood eye 7 mik ph Hand Soap 7.8- 8.0 11-12

Ha Che coon CH मा 7 nee coo H+ HCO Coolm) is around 3-4 pH of c4coon (0.01M) is around Both are acids pH can be determine with universal pH - 14 test paper. NaoH Netf oh NH₃ + H₂O Both NaOH and NH₂ are Sese and pH around con pa be determine 34 -14 test paper Nace Net eco- Kce Ateco- Both are salt and there ph is NH₂. Ho 11-12 Hot Na, coz NaOH is make > 2NaOH + H₂ coz Strong Sase and its a molecule doludes basic so pa 10-11 NHy oH + 2Hce 2H0 molecule solution NH y C af H₂O Because is acidic pH s 4-5
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