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