Penelitian ini bertujuan untuk mengetahui kelayakan Lembar Kerja Praktikum (LKP) berorientasi problem solving untuk melatihkan keterampilan proses sains pada materi hidrolisis garam. Pengembangan LKP ini menggunakan metode Research and Development (R & D) yang dibatasi sampai dengan uji coba terbatas kepada 15 peserta didik di kelas XI IPA  SMAN 4 Bangkalan. LKP ini disusun berdasarkan komponen problem solving dengan keterampilan proses sains yang dilatihkan yaitu merumuskan masalah, merumuskan hipotesis, mengontrol variabel, merancang investigasi, memproses data, menganalisis data dan membuat simpulan. Kelayakan LKP yang diteliti meliputi (1) validitas yang ditinjau dari kriteria isi, bahasa, grafis dan penyajian, (2) keefektifan yang ditinjau dari hasil tes keterampilan proses sains peserta didik, (3) kepraktisan yang ditinjau hasil respon peserta didik terhadap LKP. Hasil penelitian menunjukkan kelayakan LKP yang ditinjau dari validitas  kriteria isi, bahasa, grafis dan penyajian dinyatakan sangat layak dengan persentase berturut-turut 88,52%;88,89%;88,34%; dan 85,34%. Keefektifan LKP dinyatakan layak digunakan ditinjau dari hasil tes keterampilan proses sains mendapatkan rata-rata n-gain score 0,70 dengan kriteria tinggi. Kepraktisan dinyatakan sangat layak ditinjau dari respon peserta didik memperoleh respon positif dengan persentase 96,16%. Berdasarkan dari ketiga kriteria kelayakan LKP berorientasi problem solving dinyatakan layak untuk digunakan pada proses pembelajaran.

Kata Kunci: LKP, problem solving, keterampilan proses sains, hidrolisis garam.

The aims of this research is determine the feasibility of problem solving oriented Practical Worksheet (LKP) to practice science process skills in salt hydrolysis material. The design of development research uses the Research and Development (R & D) method which was limited by limited trials to 15 students in class XI IPA  of SMAN 4 Bangkalan. LKP is arranged based on the problem solving component with practice science process skills that include namely formulating problems, formulating hypotheses, controlling variables, designing investigations, processing data, analyzing data and making conclusions. The feasibility of the LKP studied included (1) validity in terms of content, language, graphics and presentation criteria, (2) effectiveness viewed from the results of tests of students 'science process skills, (3) practicality reviewed by students' responses to the LKP. The results showed that the feasibility of the LKP in terms of the criteria of content, language, graphics and presentation was stated to be very feasible with a percentage of 88.52%, 88.89%, 88.34%; and 85.34%. The effectiveness of LKPs that are declared feasible to use in terms of the results of the science process skills test get an average n-gain score of 0.70 with high criteria. Practicality was stated to be very feasible in terms of the response of students to obtain a positive response with a percentage of 96.16%.

Keywords: Practical Worksheet, Problem Solving, Science Proceeses Skills, Salt Hidrolysis