The best replacement for strong acids is weak acids.

The best alternatives to strong acids are rated as following:
★★★★★  weak acids
★★★  strong bases
★★  bases
★  weak bases
  weak
  strong electrolytes

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

Other search terms related to strong acids and their ratings are:
★★★★★ strong base
★★★ strong bases
weak bases
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strong acids
weak acids
strong bases