Question

1. What color does the given litmus paper turn when exposed to the following solutions (6)? b) Red litmus paper exposed to a base. a) Blue litmus paper exposed to an acid. c) Alkacid paper exposed to a strong base 1. Write the balanced equilibrium reaction and the equilibrium constant expression for a saturated solution of Ca(OH)2(s) in water (8). 3. Complete the table below S measured or calculated value show your neat and complete calculation below (2) pH= (4) pOH= (6) (OH] = (4) [Ca2)= (10) Kap (8) The literature value for the Ksp for Ca(OH)2(s) is 6.5 x 10 Calculate the percent error

Answer 1

SOLN 1

(a) blue litmus turn red when it comes in contact with an acid  solution

(b) Red litmus turn blue when it comes in contact with an base

(c) when exposed to strong base pH may well above 10 hence color of the paper will be Blue

(Note : red (pH 2), orange (pH 4), yellow (pH 6), green (pH 8), blue (pH 10) )

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