Acid Splash 4e FAQ FAQ
Can Acid Splash be used as a ranged basic attack in D&D 4e?
No. The D&D Portal 4e conversion of Acid Splash is an at-will ranged attack power, but it does not have a rule allowing it to function as a ranged basic attack. Being At-Will and Ranged is not enough by itself. This is an intentional difference from the official Sorcerer power Acid Orb, which specifically states that it can be used as a ranged basic attack. If another effect tells a character to make a ranged basic attack, the default Portal Acid Splash conversion cannot normally be substituted for that attack.
Ranged attack power and ranged basic attack are separate rules concepts in D&D 4e. A large number of class powers attack at range, but that does not automatically place them in the basic-attack category used by other powers, class features, and granted attacks. This distinction matters especially for Acid Splash because its closest official comparison, Acid Orb, does receive explicit ranged-basic-attack permission. D&D Portal deliberately does not copy that feature into the conversion.
A ranged power is not automatically a ranged basic attack
Acid 
D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Splash has Ranged 10, which defines the distance at which its primary target can be chosen. That range entry says nothing by itself about whether the power counts as a ranged basic attack.
Basic attacks are a specific part of the 4e rules vocabulary. Other powers can tell a character to make a basic attack, grant one outside the character’s normal turn, or provide bonuses that apply only when a basic attack is used.
When a rule specifically asks for a ranged basic attack, a normal ranged class power cannot simply be substituted unless that power or another rule explicitly gives permission to do so.
Acid Orb has explicit ranged-basic-attack permission
Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Orb includes a special rule stating that the power can be used as a ranged basic attack. That sentence is a mechanical exception that expands how the power can be used.
Because of that exception, Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Orb can qualify when another effect grants or requires a ranged basic attack. It is not limited to being chosen only as a normal standard-action class power on the Sorcerer 
D&D Portal - Sorcerer Character class A Charisma-based known-spell full caster whose Sorcery Points and Metamagic reshape spells in ways other casters cannot. Full link: https://dnd-portal.com/classes/sorcerer/’s turn.
Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Splash contains no equivalent rule in the Portal conversion. Similarities in level, usage, damage type, or attack defense do not cause it to inherit Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Orb’s special basic-attack status.
Why the Portal conversion does not copy that feature
The conversion already receives a tactical benefit that Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Orb does not have: a successful hit can damage one enemy adjacent to the primary target. That gives Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Splash value when opponents are positioned together.
Giving Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Splash the ranged-basic-attack feature as well would add another important layer of flexibility. It would open the power to additional granted attacks and class interactions while keeping the secondary splash benefit.
The default conversion therefore leaves that feature with Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Orb. Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Orb emphasizes long range, primary-target damage, and basic-attack utility; Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Splash emphasizes shorter-range positional pressure.
What if an effect grants a ranged basic attack?
If another creature, power, or class feature instructs a character to make a ranged basic attack, the character must choose an attack that actually qualifies for that instruction.
The Portal Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Splash conversion does not qualify on its own. Its At-Will usage does not change that, and the fact that it makes a ranged attack 
D&D Portal - Attack Roll Combat rule Attack Roll is a combat rule used by attacks,
damage, defenses, or turn order. Full link: https://dnd-portal.com/rules/combat/attack-roll/ does not transform it into a basic attack.
Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Orb can qualify because its own power text provides the necessary permission. Other powers may also qualify if they contain a similar explicit rule.
Can a DM allow Acid Splash as a ranged basic attack?
Yes. Acid D&D Portal - Acid Damage type Acid is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/acid/ Splash is already homebrew, so a DM can change the conversion for a particular campaign and add permission for it to function as a ranged basic attack.
That change should be treated as a balance adjustment rather than as clarification of the default power. Ranged-basic-attack status can matter frequently because it creates interactions with effects that grant attacks outside the normal use of the power.
For consistency, D&D Portal leaves the feature off the standard conversion. If a table adds it, that version should be recorded as a campaign house rule so players know they are using a modified form of the Portal power.