Assertion: ionized ammonia | /r/CapableOf | exist at higher ph
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text: In general, more un-ionised ammonia exists at higher pH and hence overall toxicity is greater, although the toxicity of the un-ionised form is less at higher pH. However, data also indicate that at lower pH, less un-ionised NH 3 is needed to produce its toxic effects because the ammonium ion is responsible for some of the toxicity.