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qid 4553 · chemistry

Question: Each liter of human blood serum contains about 3.4 g of sodium ions (Na^+, ionic weight = 23 g/mole) . What is the molarityof Na^+ in human blood serum?

  1. 0.15 M
  2. 0.10 M
  3. 1.48 M
  4. 2.30 M
  5. 3.4 M
  6. 1.00 M
  7. 23 M
  8. 0.34 M
  9. 0.50 M
  10. 0.23 M

Our answer: A. 0.15 M Source quote machine-checked (exact quote)

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Stored method, replayed by code (kind: formula)

card: formula · card sha256 03fbe113db1ec3c3…

Current source

MedlinePlus Medical Encyclopedia, "Sodium blood test"

https://medlineplus.gov/ency/article/003481.htm

“The normal range for blood sodium levels is 135 to 145 milliequivalents per liter (mEq/L).”

Source quote machine-checked (exact quote)

retrieved 2026-09-18T01:44:33.206Z

page text sha256 c5fe282a3333f4ef… · content sha256 72ba58c822ce67ab…

addendum formula_qid4553.formula_ADDENDUM_source_rs20260918T014433Z · sha256 52419c4cbc6dba54… · replaces the version below, addendum sha256 77c7a5f6455c0f57…

Earlier version (superseded)

https://medlineplus.gov/ency/article/003481.htm

Source weak (http_get_200_text_and_question_terms)

retrieved 2026-09-17T01:43:37.349Z

page text sha256 0c1df0b54949aa39… · content sha256 —

addendum formula_qid4553.formula_ADDENDUM_source_bf20260917T014337Z · sha256 77c7a5f6455c0f57… · replaces the version below, addendum sha256 256047bf9e895fc3…

Earlier version (superseded)

No public source has been found for this card yet (2 places checked internally).

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