Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Sodium Tetraphenylborate (Sodium Tetraphenylboron) Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for Sodium Tetraphenylborate provides, in addition to common physical constants, a general description including typical appearance, applications, and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Loss on Drying, and Clarity of Solution.
NaB(C6H5)4
Formula Wt 342.22
CAS No. 143-66-8
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . white solid Applications . . . . . . . . . . . . . . . . . . . . . . . . determination of potassium, ammonium, rubidium, and cesium Aqueous solubility . . . . . . . . . . . . . . . . . . . . freely soluble
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.5% NaB(C6H5)4 Maximum Allowable Loss on drying . . . . . . . . . . . . . . . . . . . . . . 0.5% Clarity of solution . . . . . . . . . . . . . . . . . . . . Passes test
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4373 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay (By gravimetry). Weigh accurately about 0.5 g, dissolve in 100 mL of water, and add 1 mL of acetic acid. Add, with constant stirring, 25 mL of 5% potassium hydrogen phthalate solution, and allow to stand for 2 h. Filter through a tared, fine-porosity filtering crucible, wash with three 5 mL portions of saturated potassium tetraphenylborate solution, and dry at 105 °C for 1 h. The weight of the potassium tetraphenylborate multiplied by 0.9551 corresponds to the weight of the sodium tetraphenylborate.
Loss on Drying Weigh accurately about 1.5 g, and dry at 105 °C to constant weight.
Clarity of Solution Weigh 1.5 g, add 250 mL of water and 0.75 g of hydrated aluminum oxide, stir for 5 min, and filter through a filter paper. Filter the first 25 mL portion again. The filtrate should be clear.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4373 ACS Reagent Chemicals, Part 4
