The best replacement for weak acid is strong acid.

The best alternatives to weak acid are rated as following:
★★★★★  strong acid
★★★★  weak base
★★  strong base
★★  dilute acid
  dilute strong acid
  strong base titration

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Speaking about weak acid, one probably shouldn't forget about strong base.

Other search terms related to weak acid and their ratings are:
★★★★★ strong base
★★★★ weak base
★★★★ strong acid
★★★ weak base titration
★★ strong base reaction
★ strong base ph
weak acid
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weak acid
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