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h2po4 strong or weak
h2po4 strong or weak acid
h3po4 strong or weak
h3po4 strong or weak base
is h2po4 a weak acid
h3po4 acid or base strong or weak
h3po4 weak or strong acid
is h2po4 a strong acid
is h3po4 a weak base
h3po4 a weak acid
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