. a) What are some of the important properties of a primary stan a) What are som
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Question
. a) What are some of the important properties of a primary stan a) What are some of the important properties of a primary standard? 1. b) What is the primary standard used in this experiment? Give its name and formula. c) Why can we not use NaOH as a primary standard? 2. In this experiment, b What is the b) What is the indicator? a) What is the titrant? c) what is the color change at the endpoint?- Differentiate between an equivalence point and an endpoint in an acid-base titration. to 3. 4. What is a monoprotic acid? What is the stoichiometric ratio of its reaction with NaOH solution? Provide an exam 5. Calculate the moles of KHP in 0.4895 g of KHP 6. Calculate the mass of KHP needed to neutralize 18 mL of 0.15 M NaOH solution.Explanation / Answer
1)
a)
primary standard concentration doesnot vary with time so these are very important performing experiment . if concentration chaneges with time we need to prepare every time it is needed
b)
KHP is primary standard here. name potassiumhydrogen pthalate formula KHC8H4O4
c)
NaOH is hygrosocopic in nature . it catches water from surroundings so its volume increases as a result molarity decreases . so we cannot use this as primary standard
2)
a ) NaOH
b) phenalpthalene
c) colorless to light pink
3)
end point : in acid base reaction the point where the reaction completes
equivalece point : total moles of acid = total moles of base that mean only salt is present at this point
4)
an acid which has only one proton
1:1
CH3COOH + NaOH-------------> CH3COONa + H2O
5)
moles of KHP = 0.4895 / 204.23 = 2.40 x 10^-3
6)
moles of NaOH = moles of KHP
18 x 0.15 / 1000 = moles of KHP
moles of KHP = 2.7 x 10^-3
mass of KHP = 2.7 x 10^-3 x 204.23 = 0.55 g
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