Indicators Several chemicals change colour when they are placed in acidic or basic solutions ______ Some are natural (Red Cabbage) and some are synthetic.

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Presentation transcript:

Indicators Several chemicals change colour when they are placed in acidic or basic solutions ______ Some are natural (Red Cabbage) and some are synthetic (Bromothymol) Common indicators p. 270

Neutralization Reactions When an acid reacts with a base pH moves towards 7 Double displacement reactions – E.g. HCl (aq) + NaOH (aq)  ___________________ Produces a ____and _____ _____________________

Neutralization Examples HCl + NaOH  H 2 O + NaCl H 2 SO 4 + 2KOH  _______________ Basically… H + + OH -  HOH = H 2 O The other portions of the acid and base join to make a salt.

What is a salt? A combination of positive and negative ions formed by the reaction of an acid and a base (ionic compound). _________

Application of Neutralization Reactions Cleaning up chemical spills

Application Con’t Base + Acid  Water + Salt

Application - Heart Burn Heart Burn Video

Heart Burn Your stomach produces hydrochloric acid with a pH around _____ Some of the acid can escape up into your ____________(where the food goes down) causing discomfort

Heart Burn Neutralization Reaction 2HCl (aq) + Mg(OH) 2(aq)  _______ + _______ Stomach Acid Antacid WaterSalt (HCl)(Base)