WebFigure 14.20 Titration curves for strong and weak acids illustrating the proper choice of acid-base indicator. Any of the three indicators will exhibit a reasonably sharp color change at … Web20. nov 2024 · Phenolphthalein, also known as phph, is a weak acid. The crystalline solid of this mildly acidic compound is white to yellow in color. It is colorless in solution but has two distinct structures depending on whether it is alkali (red) or acid (green). Chemists can use indicator to visually determine whether a substance is acid or a base.
19 questions with answers in PHENOLPHTHALEIN Science topic
Web7. apr 2024 · Phenolphthalein is a slightly acidic compound, hence considered a weak acid. Phenolphthalein has the chemical formula of C20H14O4and is a large organic molecule. … WebPhenolphthalein, HIn, is a weak acid. answer 4 ( f ) Add To Classified Methyl orange is another acid-base indicator. Its structure in aqueous solution at pH 4.4 is shown. 4 ( f ) (I) Add To Classified 1 Mark On the structure of methyl orange, circle the bond or bonds that make this compound a dye. fire kirin login page
4. Why do you think only two drops of phenolphthalein are used in …
WebWeak acid-weak base. The shape of a weak acid’s or base’s titration curve depends on the acid’s or base’s identity and the associated acid ionization constant. In the titration of a weak acid or a weak base, the pH gradually changes around the equivalence point, which is greater or less than 7. Below are examples of these titrations. Web2.Titration of a weak acid against a strong base : (Example, Oxalic acid vs NaOH) There is a little change in the pH value at the end point in this type of titration. The pH value changes from 6.5 to 10. Thus phenolphthalein is the suitable indicator for this titration as its working range is 8.3 - 10. Web11. apr 2024 · The acid titration (strong or weak) was performed by filling the paper channel with aliquots of titrant mixture containing 0.1 mol L −1 NaOH and 1% (m/v) phenolphthalein, which formed a pink coloration along the entire channel on the paper substrate. The devices were allowed to dry at room temperature (23±1 °C) for 5 minutes. fire kirin game app