4. Given the data shown, what two substances does the unknown mixture contain? Substance Appearance

Vinegar

Litmus

(ph)

R-B Base

B-R Acid

Biuret

(protein)

lodine

(starch)

Powder

0

+

Baking

Powder

Baking

Soda

Corn

Starch

Powder

Base

+

Powder

0

Gelatin

Crystal

Acid

+

Salt

Crystal

0

Unknown

Acid

Crystal

& Powder

Mixed

Mixed

A. Gelatin and baking powder

B. Gelatin and baking soda

C. Gelatin and corn starch

D. Salt and corn starch