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Final answer:Thestrength of a baseis determined by its ability to donate a hydrogen proton. The order of base strength from highest to lowest among the compounds provided is: methytamine, sulfate ion, hydrogen phosphate ion, ammonia, and nitrite ion.Explanation:The compounds you asked about fall under the category of bases. The strength of a base is largely determined by its Kb value, with higher values indicating stronger bases. By evaluating the protonation reactions, we can establish a trend in base strength.Ammonia(NH3) is a weak base, which donates a small percentage of its hydrogens when dissolved in water. Thehydrogen phosphateion (HPO₄²⁻) is a polyatomic anion and acts as a weak base when reacting with water. Comparatively,nitrite ion(NO₂) is a weaker base, and thesulfate ion(SO₄²⁻) has two negative charges, which make it a stronger base.Finally,methytamine(CH₃NH₂), due to its structure and ability to donate a hydrogen proton, is considered a strong base compared to the others. Therefore, the order of decreasing base strength is: methytamine CH₃NH₂ > sulfate ion (SO₄²⁻) > hydrogen phosphate ion (HPO₄²⁻) > ammonia (NH3) > nitrite ion (NO₂).Learn more aboutBase Strengthhere:brainly.com/question/32498348#SPJ11...