Which compound is used to remove skins from tomatoes, potatoes and other fruits and vegetables for canning and as an ingredient in food preservatives, which helps prevent the growth of mold and bacteria in food?
Sodium hydroxide
The correct answer is Sodium hydroxide.
Food preservation methods work by preventing or slowing down the growth of microorganisms (bacteria, mold, yeast) and inhibiting chemical reactions that cause spoilage (like oxidation). Canning itself is a preservation method that uses heat sterilization to kill microorganisms and create a vacuum seal to prevent re-contamination. While sodium hydroxide aids in preparing the product for canning (by removing skins and reducing initial microbial load through high pH), the final preservation relies on the canning process.
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