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pri določanju s kolorimetrično ekvivalentno točko se morata raztopinam borove kisline dodati indikatorja metil rdeče in bromokrezol.
when colorimetric end-point detection is applied, methyl red and bromocresol indicators must be added to the boric acid solutions.
raztopite 0,1 g metil rdečega v 95 ml metanola in 5 ml vode in zmešajte z 0,5 g bromokrezol zelenega, raztopljenega v 475 ml etanola in 25 ml vode.
dissolve 0,1 g of methyl red in 95 ml of ethanol and 5 ml of water, and mix with 0,5 g of bromocresol green dissolved in 475 ml of ethanol and 25 ml of water.
z vodo razredčimo do približno 100 ml. segrejemo do vrenja, dodamo osem do deset kapljic raztopine bromokrezol zelenega (3.8) in 30 ml tople raztopine amonijevega oksalata (3.5).
make the volume up to approximately 100 ml with water. bring to the boil, add eight to ten drops of bromo-cresol green solution (3.8) and 30 ml of a warm solution of ammonium oxalate (3.5).