Thank you for bringing this to our attention. The text box was 'hiding' that footnote, so well done for noticing this.
This has now been corrected and an updated version can be found here SOP: Preparing sodium hydroxide solutions
Science Assist - SOP Preparing Sodium Hydroxide solutions: In the table: "Mass of Sodium Hydroxide required to prepare 1 L of dilute solution" on page 2 of 3 of the SOP refers to a required molarity of 6M and there is a small 'b' beside the value of 6M. I cannot see the footnote which explains why this letter 'b' is beside this concentration for Sodium Hydroxide.
Could you please explain. Thank you.
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