ABSTRAK Banyak peneliti yang telah menyarankan bahwa siswa harus dilibatkan dalam proses penemuan konsep kimia melalui Keterampilan Proses Sains (KPS) dan pembelajaran inkuiri. Namun, menjadi tantangan tersendiri jika KPS dan pembelajaran inkuiri diterapkan pada siswa yang telah terbiasa pada pembelajaran berpusat pada guru, belum pernah sama sekali mengenal KPS dan pembelajaran inkuiri, salah satunya adalah siswa kelas XI IPA MAN 1 Pati. Oleh karena itu melalui penelitian ini bagaimana

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... KPS melalui Process Oriented Guided Inquiry Learning (POGIL) pada materi asam basa dan larutan penyangga pada siswa tersebut akan diuraikan. Kualitas KPS tersebut diperoleh melalui mixed methods dengan desain embedded concurrent. Data penelitian diperoleh melalui teknik observasi, wawancara, dan catatan lapangan. Berdasarkan data hasil penelitian yang diperoleh secara keseluruhan menunjukkan bahwa siswa kelas XI IPA MAN 1 Pati mempunyai KPS yang cukup baik dengan persentase rata-rata 67,34%. Setiap aspek KPS diantaranya pada aspek mengamati 85,00% (Baik); aspek mengklasifikasi 77,12% (Baik); aspek menggunakan alat dan bahan 80,62% (Baik); aspek mengukur 55,00% (Kurang); aspek menginterpretasi data 66,00% (Cukup); aspek mengkomunikasikan 58,78% (Cukup); dan aspek menyimpulkan 47,62% (Kurang). Kemampuan siswa pada aspek mengukur dan menyimpulkan belum memuaskan pada kegiatan praktikum asam basa dan larutan penyangga yang telah dilaksanakan. Kata kunci: keterampilan proses sains, pendekatan pembelajaran, pembelajaran kimia ABSTRACT There are many researchers who suggested that students must be engaged in the invention of their understanding to the chemistry concepts by Science Process Skills (SPS) and inquiry learning. However, it will be challenge if SPS and inquiry learning are applied to the students who have been accustomed learning in the teacher centered classroom and they do not recognize the SPS and inquiry learning yet. This research was carried out at MAN 1 Pati to students in class of XI-IPA who studied by teacher center learning method. In this paper, we will discuss the quality of SPS through Process Oriented Guided Inquiry Learning (POGIL) which has been implemented in that class, the students' understanding as the mastery aspect of the concepts and its relationship to the SPS. We proposed that the quality of SPS will be obtained by the mixed methods with embedded concurrent design. Also, we collected the data by observation, interview, and field notes. As the result, the data shown that the students in the class of XI IPA at MAN 1 Pati had a good enough of SPS with average percentage 67.34. Moreover, their average and quality of observing was 85 (good), classifying was 77.12 (very good), handling laboratory equipment and chemicals was 55 (less), data interpretation was 66 (enough), and making a conclusion was 47.62 (less). In other words, the students ability to measure and make a conclusion in this research by doing experiment of acid, base, and buffer concepts are not satisfied yet.