Question

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Q.1 Consider the unbalanced molecular equation in which citric acid H2CH30, is reacted with potassium hydroxide: H2CH3O(aq) + KOH ---à K3C.H:07 (aq) + H20 (1) If 42.9 ml of 1.30 M KOH is titrated with 27.0 ml of citric acid. What is the molarity of citric acid? Q.2 Calculate the weight required to prepare 250 ml of 0.01N CuSO4 CuSO4---à Cu2+ + 2e- Q.3 Explain the difference between precision and accuracy.

Answer 1

of H₂ C. Hg Oy tkoH K₂Cc Hş Of +31420 L mole citric acid is neutrilized by 3 moles of koy. So, we have to multiply concentration citric acid with 3, so lets its concentration is 3m, Using Molarity Equation, ท, V, molarity of citric and V, is volume of citric and My is molarity of Koh V M₂ V where کا ہم mo is volume Kohi 3m x 27 = 1.3*42.9 M 1.384.29 27x3 0.0688 m 0.0688 m So, Indarity of citric aud

2: 0.01N Normality Equivalent weight of cusOy = molar wei weight - transferred 159-6 e = 79.8 gm equivalent. Mormality – Giver. Mass Equivalent weight Volume (me) 0.0) 2 x 1000 4 7918 265 Dual X 7918 4 24 0.1995 02 0.2 gm. So, mass of cusoy required = o.2gm. 3 is Accuracy tells that how close measured value to the correct measurement where as precision tells that when several measurements are taken, how close they are to each other eg. Suppose values are & correct value is 1.256 1-23, 1-24,1:25, 1-24 Accurate value 1.25. Precise value is 1.244 as there are two values of 1.24 g

flasks may con error: 4. Sources of Error! (9) Beakers be moist / wet in If beakers / flasks are wet, there may be change in measurement It cause (be) Chemicals should be kept close with lid- If chemicals open, it may come in contact with particles - So, it can contaminate chemical cause error in experiment (c) Error in measurement are calculated, it should be when of chemicals measured dust 4 foriegn & cam mass carefully