Discussion
Soda ash is added to a glass batch in order to
Answer: C
Correct answer: lower the melting temperature usefully
Pure silica melts near 1,700 degrees, which is impractical for volume production. Sodium oxide from the soda ash disrupts the silica network and brings the melting temperature down by several hundred degrees. What it does not do is improve the glass - it makes it soluble, which is why lime must be added alongside it.
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