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In clay content determination of molding sand, which is the base solution used?

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in Casting-Forming-Welding I by (687k points)
In clay content determination of molding sand, which is the base solution used?

(a) KOH

(b) NaOH

(c) Mg(OH)2

(d) Ca(OH)2

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This intriguing question originated from Testing of Molding Sand topic in division Sand Preparation of Casting-Forming-Welding I

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The correct choice is (b) NaOH

For explanation: For knowing the exact details of the compositions present in the sand, various tests have to be performed. In clay content determination of the molding sand, 3% sodium hydroxide (NaOH) is used.

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