Practice Quiz

HT Histotechnician

Category - Fixation

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What is the formula needed to prepare a 10% formol-saline?
  1. 100ml of 40% formaldehyde, 9g of NaCl, and 900ml of distilled water
  2. 100ml of 10% formaldehyde, 10g of NaCl, and 1000ml of distilled water
  3. 100ml of 5% formaldehyde, 11g of NaCl, and 1200ml of distilled water
  4. 100ml of 20% formaldehyde, 5g of NaCl, and 1500ml of distilled water
Explanation
Answer: A - 100ml of 40% formaldehyde, 9g of NaCl, and 900ml of distilled water
The formula needed to prepare 10% formol-saline is mixing 2 aqueous solutions of 100ml of 40% formaldehyde and 900ml of distilled water, and adding 9 grams of NaCl. The other preparations are false and inaccurate.
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