9_3a_uses of neutralization

Chemical waste from factories may contain acids or alkalis. To reduce pollution caused by alkalis, the waste should be neutralized with suitable _____ before it is discharged.

Bee stings, mosquito bikes and ant bites are acidic. ______ in soap solution helps neutralize the acids in the sting or bite.

Wasp (黃蜂) stings are alkaline . Acid in _______ (醋) can help neutralize the alkali in the stings.

Farmers can add ____ (石灰) to acidic soil to help neutralize acids in the soil.

If the pH value of the soil is too high, farmers can add ______________ (硫) to the soil. Bacteria in the soil can convert sulphur to sulphuric acid, which neutralizes the alkalis in the soil.

metal + acid → salt + ________

zinc + hydrochloric acid → hydrogen + ____ ________

copper + hydrochloric acid → __ ________

Dilute acids corrode building materials which contain calcium carbonate, such as ______(大理石).

carbonate + acid → salt + water + ______ _______