Selected Ions Forming Aqueous Solutions - Revision history

Conrad: Show the official table image instead of a wikitext copy; row anchors now land on the image

2026-10-25T21:39:46Z

Show the official table image instead of a wikitext copy; row anchors now land on the image

Conrad: Make the Regents Exam Questions table scroll sideways on narrow screens instead of widening the page

2026-10-25T21:31:21Z

Make the Regents Exam Questions table scroll sideways on narrow screens instead of widening the page

Conrad: Chemistry reference tables (2025 Edition): new reference table page

2026-10-25T19:49:07Z

Chemistry reference tables (2025 Edition): new reference table page

New page

{{Chemreftable
|name=Selected Ions Forming Aqueous Solutions
|prev=Symbols Used in Nuclear Chemistry
|next=Mathematical and Computational Models
|desc=Selected Ions Forming Aqueous Solutions from the NYS Chemistry Reference Tables (2025 Edition): Group 1 metal ions, ammonium, acetate, chlorate, hydrogen carbonate and nitrate, with their formulas and charges. Supports HS-PS1-10.
}}
The '''Selected Ions Forming Aqueous Solutions''' table from the ''Reference Tables for Physical Science: Chemistry'' (2025 Edition) lists six ions whose compounds dissolve in water, with their formulas and charges. It primarily supports [[HS-PS1-10]], and it also comes up in [[HS-PS1-2]] (which products stay dissolved), [[HS-PS1-12]] (spectator ions in net ionic equations) and [[HS-PS3-5]] (how ions interact with water molecules).

{| class="wikitable" style="text-align:center;"
! Name !! Formula
|-
| Group 1 metals || Li+, Na+, etc.
|-
| ammonium || NH4+
|-
| acetate || C2H3O2−
|-
| chlorate || ClO3−
|-
| hydrogen carbonate || HCO3−
|-
| nitrate || NO3−
|}

== What the selected ions table shows ==
These are the ions whose compounds are soluble in water whatever the other ion is: the Group 1 metal ions (Li+, Na+, K+, …), ammonium, acetate, chlorate, hydrogen carbonate and nitrate. A compound containing any of them dissolves to give a solution of mobile ions, and when such a compound is a product of a reaction in solution it stays dissolved rather than precipitating. The table also gives the formula and charge of the four polyatomic ions on it.

The 2011 edition of the Chemistry Reference Tables covered the same ground in more detail: Table F (solubility guidelines) listed these ions as forming soluble compounds and went on to give the halide and sulfate exceptions and the insoluble ions, Table G gave solubility curves, and Table E listed two dozen polyatomic ions. The 2025 edition keeps only this short list, so the formulas of other polyatomic ions (phosphate, sulfate, hydroxide, …) and any solubility data are supplied in the question cluster when they are needed.

== Regents Exam Questions ==
Released Regents questions that cannot be answered without this table, listed by exam. Each link opens the question with its answer key; the standard is the one the question assesses.

{| class="wikitable" style="width:100%; text-align:center"
! style="padding: 0.5em 1.5em;" | Exam
! style="padding: 0.5em 1.5em;" | Cluster
! style="padding: 0.5em 1.5em;" | Question
! style="padding: 0.5em 1.5em;" | Standard
|-
| rowspan="2" style="background-color:white;" | [[August 2026 Chemistry Exam|August 2026 Chemistry Regents]]
| style="background-color:white;" | [[Questions:Go With the Flow|Go With the Flow]]
| style="background-color:white;" | [[Questions:Go With the Flow#q4|Question 21]]
| style="background-color:white;" | [[HS-PS3-5]]
|-
| style="background-color:white;" | [[Questions:Pool Water Chemistry|Pool Water Chemistry]]
| style="background-color:white;" | [[Questions:Pool Water Chemistry#q1|Question 22]]
| style="background-color:white;" | [[HS-PS1-2]]
|}

@@ Line 7: / Line 7: @@
 The '''Selected Ions Forming Aqueous Solutions''' table from the ''Reference Tables for Physical Science: Chemistry'' (2025 Edition) lists six ions whose compounds dissolve in water, with their formulas and charges. It primarily supports [[HS-PS1-10]], and it also comes up in [[HS-PS1-2]] (which products stay dissolved), [[HS-PS1-12]] (spectator ions in net ionic equations) and [[HS-PS3-5]] (how ions interact with water molecules).
-{| class="wikitable" style="text-align:center;"
+[[File:Selected Ions Forming Aqueous Solutions.png|440px|class=img-fluid|alt=Selected Ions Forming Aqueous Solutions from the Chemistry Reference Tables (2025 Edition)]]
 == What the selected ions table shows ==

@@ Line 31: / Line 31: @@
 Released Regents questions that cannot be answered without this table, listed by exam. Each link opens the question with its answer key; the standard is the one the question assesses.
 {| class="wikitable" style="width:100%; text-align:center"
 ! style="padding: 0.5em 1.5em;" | Exam
@@ Line 46: / Line 47: @@
 | style="background-color:white;" | [[HS-PS1-2]]
 |}