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Sodium Carbonate is commonly available in anhydrous and monohydrous forms. The crystalline form is available as Arm & Hammer Washing Soda, which is sodium carbonate decahydrate (use the yellow, unscented box). This can be safely substituted in almost all formulas calling for carbonate.
Photographers' Formulary 10-1189 10G Specs
Soda Sal soda Soda ash Washing soda Carbonate Carbonate of soda Carbonic acid, disodium salt; disodium carbonate Soda ash
White, odorless granular powder that absorbs moisture from the air
One of the principle alkalies (accelerators) used in development
Balanced Alkali (Kodalk) can be used as a substitute for carbonate or vice versa.
Cautions: Sodium carbonate releases a gas when added to an acid stop bath or an acid fixing bath; this gas may cause pinholes, or "blistering," to develop in film emulsions.