I got this test kit, the 4 part package with Mandelin, Liebermann, Morris and Froehde. The former three tested fine but I'm curious about the result I got with the Froehde test. It said there was supposed to be no reaction. There was no color change, but there was still a little bit of fizzing when the drop of solution hit the little pile of K. Should that be cause for concern? When they say no reaction, are they saying that there shouldn't be any color change, or that there shouldn't be any reaction of any kind? I think of fizzing as a reaction. And I tested just dropping a drop onto the plastic lid I was using for the test surface with no K and there was indeed no fizzing of any kind.
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RT&DC Moderators: Senior Staff
Ketamine testing "no reaction" meaning
- Thread starter scabbard
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It should say "no colour change".
This fizzing reaction occurs because the strong sulfuric acid displaces the hydrogen chloride ion from the ketamine hydrochloride, giving ketamine sulfate for 0.1ms before the whole thing is destroyed to get the colour change.
FWIW, this confusion doesn't happen with solid crystal reagent tests, because they slow down the reaction a little bit, so you don't notice the gas being released.
This fizzing reaction occurs because the strong sulfuric acid displaces the hydrogen chloride ion from the ketamine hydrochloride, giving ketamine sulfate for 0.1ms before the whole thing is destroyed to get the colour change.
FWIW, this confusion doesn't happen with solid crystal reagent tests, because they slow down the reaction a little bit, so you don't notice the gas being released.
OK I think I'm understanding what you're saying correctly, but when you say the whole thing is destroyed to get the color change - there shouldn't be any color change if it is indeed ketamine hydrochloride, correct?