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All Journal Jurnal Akademika Kimia
Sitti Aminah
Universitas Tadulako, Palu – Indonesia 94119
Chemistry Education

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Utilization of Kalpataru Flower Extract (Hura crepitans Linn) as an Alternative Acid Base Indicator Bayu Riswanto; Sitti Aminah
Jurnal Akademika Kimia Vol. 9 No. 3 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (414.329 KB) | DOI: 10.22487/j24775185.2020.v9.i3.pp148-157

Abstract

Kalpataru flower (Hura crepitans Linn) is an anthocyanin-containing plant. This study aims to utilize extract from the kalpataru flower as an alternative acid base indicator and determine the type of acid-base titration suitable for extracting the kalpataru flower indicator. Kalpataru flowers are macerated with methanol solvent for around 2 hours. Kalpataru flower extract was tested as an indicator in acid-base solution, buffer, and compared with phenolphthalein and methyl orange for acid-base titration, namely: strong acids with strong bases, weak acids with strong bases, and weak bases with strong acids. The results obtained in this study were: indicator extract of brownish yellow kalpataru flowers, in strong red acids, in strong bases of dark green, in weak pink acids, and in weak bases in light green. In the buffer, the indicator extract of the kalpataru flower has a range of pH pH 4-5 (pink-colorless) and pH 9-11 (yellowish green-dark green). The indicator of kalpataru flower extract can be used on strong acid titration with strong bases, weak acids with strong bases and weak bases with strong acids. Kalpataru flower extract can be used as an acid-base indicator.
The Effect of Cooperative Learning Model STAD Type Based on Mind Mapping toward Students’ Learning Outcomes on Chemical Bond Material in 10th Grade SMA Negeri 1 North Parigi Nurhijrah Nurhijrah; Paulus H. Abram; Sitti Aminah
Jurnal Akademika Kimia Vol. 9 No. 3 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (245.903 KB) | DOI: 10.22487/j24775185.2020.v9.i3.pp168-171

Abstract

This study aimed to describe the effect of cooperative learning model STAD type based on mind mapping toward students’ learning outcomes on chemical bond material in 10th Grade SMA Negeri 1 North Parigi. This type of research was quasi experiment with a non-randomized pretest posttest control group design. Sampling was done based on special considerations (purposive sampling). The sample used in this study were students of class X Science 1 as the experimental class (n = 22) and class X Science 2 as the control class (n = 23). The results of data analysis obtained the average value ( ) of the experimental class was 72.18 with a standard deviation of 13.12, while  of the control class was 66.21 with a standard deviation of 10.04. The results of hypothesis testing with one-party t-test statistics (right party) obtained a value of tcount = 6.03 and ttable = 1.68 with a significant level of ( ) = 0.05 and dk = 43. This indicated that H0 was rejected and H1 was accepted so it can be concluded that learning outcomes with cooperative learning model STAD type based mind mapping was higher than the direct learning model on chemical bonding.
Co-Authors Bayu Riswanto Nurhijrah Nurhijrah Paulus H. Abram