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Ammonia nitrogen is present in a given wastewater sample as the ammonium ion $\text({NH}_{4}$$^{+})$ and ammonia $\text({NH}_{3})$. If $\text{pH}$ is the only deciding factor for the proportion of these two constituents, which of the following is a correct statement?

  1. At $\text{pH}$ above $9.25$, only $\text{NH}_{4}$$^{+}$ will be present
  2. At $\text{pH}$ above $9.25$, $\text{NH}_{3}$ will be predominant
  3. At $\text{pH}$ $7.0$, $\text{NH}_{4}$$^{+}$ and $\text{NH}_{3}$ will be found in equal measures
  4. At $\text{pH}$ $7.0$, $\text{NH}_{4}$$^{+}$  will be predominant
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