Sodium Fluoride (NaF) Is Added to Drinking Water in Some

question 33

Multiple Choice

Sodium fluoride (NaF) is added to drinking water in some municipalities to protect teeth against cavities. The idea is to convert hydroxyapatite, Ca₁₀(PO₄) ₆(OH) ₂, into more stable fluorapatite, Ca₁₀(PO₄) ₆F₂. The molar mass of hydroxyapatite is 502 g/mol. What is the molarity of a 10.0 mg/L sodium fluoride solution?

• A) 2.38 *10^-4 M
• B) 1.99 *10^-5 M
• C) 2.63*10^-4 M
• D) 1.19 *10^-4 M
• E) 0.263 M

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Definitions:

Single Mutation

A change in the DNA sequence affecting only one nucleotide base in the genome of an organism.

Second Letter

Refers to the second character in a sequence of letters, highlighting its position in written language or codes.

AUG

A codon in mRNA that not only codes for the amino acid methionine but also serves as the start signal for protein synthesis.

UAA

One of the three stop codons in the genetic code, signaling the end of protein synthesis during translation.