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复数形式
alkalis
1
any water-soluble compound that can turn litmus blue and reacts with an acid to form a salt and water
- Sodium hydroxide is a strong alkali commonly used in soap making.
- Alkalis like potassium carbonate are used to neutralize acids in chemistry labs.
- The chemist carefully measured the alkali to avoid a violent reaction.
- Household ammonia is a mild alkali.
- Mixing an alkali with vinegar produces a salt and water.
同义词：
2
a mixture of soluble salts present in arid soils or certain bodies of water, often harmful to agriculture
- Crops fail in fields with high alkali content in the soil.
- The farmer treated the land to reduce the alkali and improve fertility.
- Alkali deposits can form on lakebeds in dry regions.
- Irrigation can sometimes exacerbate alkali accumulation in farmland.
- The engineer tested the water for alkali levels before irrigation.