Question

Borax (sodium tetraboratedecahydrate) is a mineral found in dry lakebeds. It is used a preservative in soap and glass manufactoring. You determined the Kop for borax at several different temperatures and your results are summarized in the table below. T (°C) Кр 40 0.0305 45 0.083 50 0.204 55 0.486 60 0.776 We know that AGPxn depends on K, the equilibrium constant, from AGPx = -RTINK We also know that 4G xn depends on temperature from AG m = AH xn-TAS Setting these two equations equal to each other, we can arrive at an equation that relates Kto AH°, 45°, and T. In(Ksp) = 6°) (-) + This happens to be the equation of a straight line. ASO R

Answer 1

Ksp 10 0.00319 0.083 TOK som (ke) 0.0305 313k -3.49003 45 316k 0.00314 -2.48891 0. 204 323k 0.00309 - 1.58964 55 0.486 328k 0.00305 -0.72155 GO 0.776 333k 0.003003 -0.2536 Foto from Chart Table graph can kop Vs Of) inkk y=-177722 +53.289 R²=0.9888 Go and AS° for ksy R -OH R from ea and =) Alison 17772 R =-17772 Slope and - Ah Intercept As = 53.289 AS' = $3.289 R T=25c= 298k A High-T ASxn / Doson Ahorn 17772R - 296x53.289 R Alism 1891.878 R Å Herre Ris goss Constant = 8.314 Thralik Am = 1891.878*8.314 I/oralik Asim = 15.729 Kmalik] Thank you